Update README.md

.gitignore

@@ -0,0 +1,2 @@
+bleh
+go.sum

LICENSE

@@ -0,0 +1,18 @@
+Bleh!: Go driver for Cat Thermal Printer MXW01
+Copyright (C) 2025 Ignacio Rivero
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. 
+
+See LICENSE.gplv3 for details.
+
+---
+
+**Portions of this code are adapted from:**
+CatPrinterBLE (C#), Copyright (c) 2025 MaikelChan
+Distributed under the MIT License (see LICENSE.mit for details)
+https://github.com/MaikelChan/CatPrinterBLE
+    

LICENSE.gplv3

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

LICENSE.mit

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 MaikelChan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,81 @@
+# Bleh!
+
+<p align=center>
+<img src="./bleh.jpg"/>
+</p>
+
+**Bleh!** is a command-line utility to print images on the MXW01 Bluetooth thermal printer.
+It supports 1-bit (1bpp) and 4-bit (4bpp) printing, various dithering algorithms, PNG preview output, and direct communication with the printer via BLE.
+
+## Features
+
+* Print PNG/JPG images (from file or stdin) in 1bpp or 4bpp mode
+* Multiple dithering algorithms (Floyd-Steinberg, Bayer, Atkinson, etc.)
+* Query printer status, battery, version, and more
+* Output a PNG preview instead of printing (for integration or testing)
+* Command-line interface with fine-grained options
+* Works on Linux using BlueZ (via [go-ble/ble](https://github.com/go-ble/ble))
+
+## Compiling
+
+On a Linux system, run:
+
+```sh
+go get bleh
+```
+
+Then:
+
+```
+go build
+```
+
+If you want to be able to run it as a regular user, you'll need `setcap`:
+
+```
+sudo setcap cap_net_raw,cap_net_admin=eip ./bleh
+```
+
+## Usage
+
+```sh
+bleh [options] <image_path or ->
+```
+
+### Options
+
+| Option               | Description                                                                         |
+| -------------------- | ----------------------------------------------------------------------------------- |
+| `-i`, `--intensity`  | Print intensity (0-100) (default: 80)                                               |
+| `-m`, `--mode`       | Print mode: 1bpp or 4bpp (default: "1bpp")                                          |
+| `-d`, `--dither`     | Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn |
+| `-s`, `--status`     | Query printer status                                                                |
+| `-b`, `--battery`    | Query battery level                                                                 |
+| `-v`, `--version`    | Query printer version                                                               |
+| `-p`, `--printtype`  | Query print type                                                                    |
+| `-q`, `--querycount` | Query internal counter                                                              |
+| `-E`, `--eject`      | Eject paper by N lines                                                              |
+| `-R`, `--retract`    | Retract paper by N lines                                                            |
+| `-o`, `--output`     | Output PNG preview instead of printing. If value is "-", writes PNG to stdout.      |
+| `<image_path or ->`  | Path to PNG/JPG image to print, or "-" for stdin                                    |
+
+### Example
+
+```sh
+bleh -m 4bpp -d floyd ./myimage.png
+```
+
+## Requirements
+
+* Go 1.18+
+* BlueZ on Linux (for BLE support)
+* Dependencies listed in `go.mod` (see source)
+
+## License
+
+This project is licensed under the terms of the GNU General Public License v3.0 or later.
+Parts of the code were ported from [CatPrinterBLE](https://github.com/MaikelChan/CatPrinterBLE) and are licensed under the MIT License.
+See the [`LICENSE`](./LICENSE) file for details.
+
+> **Disclaimer:**
+> While a license was only added after the project’s initial commits, the current license applies retroactively to all previous commits of this repository.

go.mod

@@ -1,10 +1,14 @@
-module catprinter-ble
+module bleh
 
 go 1.22
 
 require (
+	github.com/disintegration/imaging v1.6.2
 	github.com/go-ble/ble v0.0.0-20240122180141-8c5522f54333
-	github.com/disintegration/imaging v1.6.2 // indirect
+	github.com/makeworld-the-better-one/dither v1.0.0
+)
+
+require (
 	github.com/mattn/go-colorable v0.1.6 // indirect
 	github.com/mattn/go-isatty v0.0.12 // indirect
 	github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b // indirect

go.sum

@@ -1,43 +0,0 @@
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/JuulLabs-OSS/cbgo v0.0.1/go.mod h1:L4YtGP+gnyD84w7+jN66ncspFRfOYB5aj9QSXaFHmBA=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/disintegration/imaging v1.6.2 h1:w1LecBlG2Lnp8B3jk5zSuNqd7b4DXhcjwek1ei82L+c=
-github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
-github.com/go-ble/ble v0.0.0-20240122180141-8c5522f54333 h1:bQK6D51cNzMSTyAf0HtM30V2IbljHTDam7jru9JNlJA=
-github.com/go-ble/ble v0.0.0-20240122180141-8c5522f54333/go.mod h1:fFJl/jD/uyILGBeD5iQ8tYHrPlJafyqCJzAyTHNJ1Uk=
-github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
-github.com/mattn/go-colorable v0.1.6 h1:6Su7aK7lXmJ/U79bYtBjLNaha4Fs1Rg9plHpcH+vvnE=
-github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
-github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
-github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
-github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b h1:j7+1HpAFS1zy5+Q4qx1fWh90gTKwiN4QCGoY9TWyyO4=
-github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
-github.com/mgutz/logxi v0.0.0-20161027140823-aebf8a7d67ab h1:n8cgpHzJ5+EDyDri2s/GC7a9+qK3/YEGnBsd0uS/8PY=
-github.com/mgutz/logxi v0.0.0-20161027140823-aebf8a7d67ab/go.mod h1:y1pL58r5z2VvAjeG1VLGc8zOQgSOzbKN7kMHPvFXJ+8=
-github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
-github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/raff/goble v0.0.0-20190909174656-72afc67d6a99/go.mod h1:CxaUhijgLFX0AROtH5mluSY71VqpjQBw9JXE2UKZmc4=
-github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
-github.com/sirupsen/logrus v1.5.0/go.mod h1:+F7Ogzej0PZc/94MaYx/nvG9jOFMD2osvC3s+Squfpo=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/urfave/cli v1.22.2/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
-golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8 h1:hVwzHzIUGRjiF7EcUjqNxk3NCfkPxbDKRdnNE1Rpg0U=
-golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
-golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20211204120058-94396e421777 h1:QAkhGVjOxMa+n4mlsAWeAU+BMZmimQAaNiMu+iUi94E=
-golang.org/x/sys v0.0.0-20211204120058-94396e421777/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

main.go

@@ -1,84 +1,125 @@
-// catprinter_ble.go
-// A Go reimplementation of the CatPrinterBLE utility
-// using Go's BLE stack and Image processing libraries
+/*
+This file is part of Bleh!.
+
+Bleh! is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Bleh! is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Foobar. If not, see <https://www.gnu.org/licenses/>.
+*/
 
 package main
 
 import (
 	"context"
+	"flag"
 	"fmt"
+	"image"
 	"image/color"
-	"github.com/disintegration/imaging"
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
+	"io"
 	"log"
 	"os"
 	"os/signal"
 	"time"
+
+	"github.com/disintegration/imaging"
 	ble "github.com/go-ble/ble"
 	"github.com/go-ble/ble/linux"
+	dither "github.com/makeworld-the-better-one/dither"
 )
 
+const minLines = 86 // firmware refuses to print anything shorter
 
 var (
-	mainServiceUUID       = ble.MustParse("ae30")
-	printCharacteristic   = ble.MustParse("ae01")
-	notifyCharacteristic  = ble.MustParse("ae02")
-	dataCharacteristic    = ble.MustParse("ae03")
-	targetPrinterName     = "MXW01"
-	scanTimeout           = 10 * time.Second
-	printCommandHeader    = []byte{0x22, 0x21}
-	printCommandFooter    = byte(0xFF)
+	mainServiceUUID      = ble.MustParse("ae30")
+	printCharacteristic  = ble.MustParse("ae01")
+	notifyCharacteristic = ble.MustParse("ae02")
+	dataCharacteristic   = ble.MustParse("ae03")
+	targetPrinterName    = "MXW01"
+	scanTimeout          = 10 * time.Second
+	printCommandHeader   = []byte{0x22, 0x21}
+	printCommandFooter   = byte(0xFF)
+	intensity            int
+	mode                 string
+	ditherType           string
+	getStatus            bool
+	getBattery           bool
+	getVersion           bool
+	getPrintType         bool
+	getQueryCount        bool
+	ejectPaper           uint
+	retractPaper         uint
+	outputPath           string
+	version		     = "dev"
 )
 
-func min(a, b int) int {
-	if a < b {
-		return a
-	}
-	return b
-}
+func init() {
+	flag.IntVar(&intensity, "intensity", 80, "Print intensity (0-100)")
+	flag.IntVar(&intensity, "i", 80, "Print intensity (0-100)")
 
-func reverseBitsInByte(b byte) byte {
-	b = (b&0xF0)>>4 | (b&0x0F)<<4
-	b = (b&0xCC)>>2 | (b&0x33)<<2
-	b = (b&0xAA)>>1 | (b&0x55)<<1
-	return b
-}
+	flag.StringVar(&mode, "mode", "1bpp", "Print mode: 1bpp or 4bpp")
+	flag.StringVar(&mode, "m", "1bpp", "Print mode: 1bpp or 4bpp")
 
-func dumpCharacteristics(client ble.Client, svc *ble.Service) {
-	chars, err := client.DiscoverCharacteristics(nil, svc)
-	if err != nil {
-		log.Fatalf("Error discovering characteristics: %v", err)
-	}
+	flag.StringVar(&ditherType, "dither", "none", "Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn")
+	flag.StringVar(&ditherType, "d", "none", "Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn")
 
-	log.Printf("Discovered %d characteristics:", len(chars))
-	for _, c := range chars {
-		props := ""
-		if c.Property&ble.CharRead != 0 {
-			props += "Read "
-		}
-		if c.Property&ble.CharWrite != 0 {
-			props += "Write "
-		}
-		if c.Property&ble.CharWriteNR != 0 {
-			props += "WriteWithoutResponse "
-		}
-		if c.Property&ble.CharNotify != 0 {
-			props += "Notify "
-		}
-		if c.Property&ble.CharIndicate != 0 {
-			props += "Indicate "
-		}
+	flag.BoolVar(&getStatus, "status", false, "Query printer status")
+	flag.BoolVar(&getStatus, "s", false, "Query printer status")
 
-		log.Printf("  UUID: %s, Properties: %s", c.UUID, props)
+	flag.BoolVar(&getBattery, "battery", false, "Query battery level")
+	flag.BoolVar(&getBattery, "b", false, "Query battery level")
+
+	flag.BoolVar(&getVersion, "version", false, "Query printer version")
+	flag.BoolVar(&getVersion, "v", false, "Query printer version")
+
+	flag.BoolVar(&getPrintType, "printtype", false, "Query print type")
+	flag.BoolVar(&getPrintType, "p", false, "Query print type")
+
+	flag.BoolVar(&getQueryCount, "querycount", false, "Query internal counter")
+	flag.BoolVar(&getQueryCount, "q", false, "Query internal counter")
+
+	flag.UintVar(&ejectPaper, "eject", 0, "Eject paper by N lines")
+	flag.UintVar(&ejectPaper, "E", 0, "Eject paper by N lines")
+
+	flag.UintVar(&retractPaper, "retract", 0, "Retract paper by N lines")
+	flag.UintVar(&retractPaper, "R", 0, "Retract paper by N lines")
+
+	flag.StringVar(&outputPath, "o", "", "Output PNG preview instead of printing (specify output path)")
+	flag.StringVar(&outputPath, "output", "", "Output PNG preview instead of printing (specify output path)")
+
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Bleh! Cat Printer Utility for MXW01, version %s\n",version)
+		fmt.Fprintf(os.Stderr, "Usage: %s [options] <image_path or ->\n", os.Args[0])
+		fmt.Fprintln(os.Stderr, `
+Options:
+  -i, --intensity int      Print intensity (0-100) (default 80)
+  -m, --mode string        Print mode: 1bpp or 4bpp (default "1bpp")
+  -d, --dither string      Dither method: none, floyd, bayer2x2, bayer4x4, bayer8x8, bayer16x16, atkinson, jjn (default "none")
+  -s, --status             Query printer status
+  -b, --battery            Query battery level
+  -v, --version            Query printer version
+  -p, --printtype          Query print type
+  -q, --querycount         Query internal counter
+  -E, --eject uint         Eject paper by N lines
+  -R, --retract uint       Retract paper by N lines
+  -o, --output <file>      Output PNG preview instead of printing.
+                           If <file> is "-", writes PNG to stdout.
+  <image_path or ->        Path to PNG/JPG to print, or '-' for stdin`)
 	}
 }
 
 func parseNotification(data []byte) {
-	if len(data) < 10 || data[0] != 0x22 || data[1] != 0x21 {
-		fmt.Println("Invalid notification header")
+	if len(data) < 2 || data[0] != 0x22 || data[1] != 0x21 {
+		fmt.Printf("Invalid notification header, raw: % X", data)
 		return
 	}
 
 	cmd := data[2]
+	dataLen := int(data[4]) | int(data[5])<<8
+
 	switch cmd {
 	case 0xA1: // GetStatus
 		battery := data[9]
@@ -111,8 +152,59 @@ func parseNotification(data []byte) {
 		}
 
 		fmt.Printf("Status: %v (%s), Battery: %d, Temp: %d\n", statusOk, statusMsg, battery, temp)
+
+	case 0xA3: // EjectPaper
+		fmt.Println("Ejecting paper...")
+
+	case 0xA4: // RetractPaper
+		fmt.Println("Retracting paper...")
+
+	case 0xA7: // QueryCount
+		if len(data) >= 12 {
+			fmt.Printf("Query count: % X\n", data[6:12])
+		}
+
+	case 0xA9: // Print
+		printOk := data[6] == 0
+		fmt.Printf("Print status: %s\n", map[bool]string{true: "Ok", false: "Failure"}[printOk])
+
+	case 0xAA: // PrintComplete
+		fmt.Println("Printing finished.")
+
+	case 0xAB: // BatteryLevel
+		fmt.Printf("Battery level: %d\n", data[6])
+
+	case 0xB0: // GetPrintType
+		var t string
+		switch data[6] {
+		case 0x01:
+			t = `High pressure`
+		case 0xFF:
+			t = `"Unknown`
+		default:
+			t = `Low pressure`
+		}
+		fmt.Printf("Print type: %s\n", t)
+
+	case 0xB1: // GetVersion
+		if len(data) < 14+dataLen {
+			fmt.Println("Malformed version notification")
+			return
+		}
+		version := string(data[6 : 6+dataLen])
+		var t string
+		switch data[14] {
+		case 0x32:
+			t = `High pressure`
+		case 0x31:
+			t = `Low pressure`
+		default:
+			t = `Unknown`
+		}
+		fmt.Printf("Version: %s, Print type: %s\n", version, t)
+
 	default:
-		fmt.Printf("Unhandled command: 0x%02X\n", cmd)
+		fmt.Printf("Received notification for unknown command: 0x%02X\n", cmd)
 	}
 }
 
@@ -121,27 +213,67 @@ const (
 	bytesPerLine = linePixels / 8
 )
 
-// Convert image to 1bpp, dithered, and packed bytes
-func loadImageMono(path string) ([]byte, int, error) {
+// decodeImage loads an image from a given path or stdin ("-")
+func decodeImage(path string) (image.Image, error) {
+	if path == "-" {
+		return decodeImageFromReader(os.Stdin)
+	}
 	img, err := imaging.Open(path, imaging.AutoOrientation(true))
 	if err != nil {
-		return nil, 0, fmt.Errorf("image open error: %v", err)
+		return nil, fmt.Errorf("failed to open image %q: %v", path, err)
 	}
+	return img, nil
+}
 
+// decodeImageFromReader reads and decodes an image from any io.Reader
+func decodeImageFromReader(r io.Reader) (image.Image, error) {
+	img, _, err := image.Decode(r)
+	if err != nil {
+		return nil, fmt.Errorf("decode error: %v", err)
+	}
+	return img, nil
+}
+
+// loadImageMonoFromImage processes an image.Image to 1bpp packed byte format
+func loadImageMonoFromImage(img image.Image, ditherType string) ([]byte, int, error) {
 	ratio := float64(img.Bounds().Dx()) / float64(img.Bounds().Dy())
 	height := int(float64(linePixels) / ratio)
 	img = imaging.Resize(img, linePixels, height, imaging.Lanczos)
 	img = imaging.Grayscale(img)
-	img = imaging.AdjustContrast(img, 10)
+
+	if ditherType != "none" {
+		palette := []color.Color{color.Black, color.White}
+		d := dither.NewDitherer(palette)
+		switch ditherType {
+		case "floyd":
+			d.Matrix = dither.FloydSteinberg
+		case "bayer2x2":
+			d.Mapper = dither.Bayer(2, 2, 1.0)
+		case "bayer4x4":
+			d.Mapper = dither.Bayer(4, 4, 1.0)
+		case "bayer8x8":
+			d.Mapper = dither.Bayer(8, 8, 1.0)
+		case "bayer16x16":
+			d.Mapper = dither.Bayer(16, 16, 1.0)
+		case "atkinson":
+			d.Matrix = dither.Atkinson
+		case "jjn":
+			d.Matrix = dither.JarvisJudiceNinke
+		default:
+			return nil, 0, fmt.Errorf("unknown dither type: %s", ditherType)
+		}
+		img = d.DitherCopy(img)
+	} else {
+		img = imaging.AdjustContrast(img, 10)
+	}
 
 	pixels := make([]byte, (linePixels*height)/8)
 	for y := 0; y < height; y++ {
 		for x := 0; x < linePixels; x++ {
 			gray := color.GrayModel.Convert(img.At(x, y)).(color.Gray)
-			if gray.Y < 127 {
+			if gray.Y < 128 {
 				idx := (y*linePixels + x) / 8
-				bit := 7 - (x % 8)
-				pixels[idx] |= 1 << bit
+				pixels[idx] |= 1 << (x % 8)
 			}
 		}
 	}
@@ -149,62 +281,330 @@ func loadImageMono(path string) ([]byte, int, error) {
 	return pixels, height, nil
 }
 
-func sendImageToPrinter(client ble.Client, dataChr, printChr *ble.Characteristic, path string) error {
-	pixels, height, err := loadImageMono(path)
-	if err != nil {
-		return err
+// loadImage4BitFromImage processes an image.Image to 4bpp packed byte format
+func loadImage4BitFromImage(img image.Image, ditherType string) ([]byte, int, error) {
+	ratio := float64(img.Bounds().Dx()) / float64(img.Bounds().Dy())
+	height := int(float64(linePixels) / ratio)
+	img = imaging.Resize(img, linePixels, height, imaging.Lanczos)
+	img = imaging.Grayscale(img)
+
+	palette := make([]color.Color, 16)
+	for i := 0; i < 16; i++ {
+		v := uint8(i * 17)
+		palette[i] = color.Gray{Y: 255 - v}
 	}
 
+	if ditherType != "none" {
+		d := dither.NewDitherer(palette)
+		switch ditherType {
+		case "floyd":
+			d.Matrix = dither.FloydSteinberg
+		case "bayer2x2":
+			d.Mapper = dither.Bayer(2, 2, 0.2)
+		case "bayer4x4":
+			d.Mapper = dither.Bayer(4, 4, 0.2)
+		case "bayer8x8":
+			d.Mapper = dither.Bayer(8, 8, 0.2)
+		case "bayer16x16":
+			d.Mapper = dither.Bayer(16, 16, 0.2)
+		case "atkinson":
+			d.Matrix = dither.Atkinson
+		case "jjn":
+			d.Matrix = dither.JarvisJudiceNinke
+		default:
+			return nil, 0, fmt.Errorf("unknown dither type: %s", ditherType)
+		}
+		img = d.DitherCopy(img)
+	}
+
+	width := linePixels
+	pixels := make([]byte, (width*height)/2)
+
+	for y := 0; y < height; y++ {
+		for x := 0; x < width; x++ {
+			gray := color.GrayModel.Convert(img.At(x, y)).(color.Gray)
+			level := (255 - gray.Y) >> 4 // 0..15, inverted logic
+			idx := (y*width + x) >> 1
+			shift := uint(((x & 1) ^ 1) << 2)
+			pixels[idx] |= level << shift
+		}
+	}
+	return pixels, height, nil
+}
+
+// Extend sendImageToPrinter to handle 4-bit mode
+type PrintMode byte
+
+const (
+	Mode1bpp PrintMode = 0x00
+	Mode4bpp PrintMode = 0x02
+)
+
+func sendImageBufferToPrinter(client ble.Client, dataChr, printChr *ble.Characteristic, pixels []byte, height int, mode PrintMode, intensity byte) error {
 	fmt.Printf("Sending image: %dx%d lines\n", linePixels, height)
 
-	cmd := buildCommand(0xA2, []byte{80}) // intensity 80
-	err = client.WriteCharacteristic(printChr, cmd, true)
-	if err != nil {
+	cmd := buildCommand(0xA2, []byte{intensity})
+	if err := client.WriteCharacteristic(printChr, cmd, true); err != nil {
 		return fmt.Errorf("intensity set failed: %v", err)
 	}
 
-	lines := height
 	param := []byte{
-		byte(lines & 0xFF), byte(lines >> 8),
-		0x30, // reserved
-		0x00, // 1bpp mode
+		byte(height & 0xFF), byte(height >> 8),
+		0x30,
+		byte(mode),
 	}
 	cmd = buildCommand(0xA9, param)
-	err = client.WriteCharacteristic(printChr, cmd, true)
-	if err != nil {
+	if err := client.WriteCharacteristic(printChr, cmd, true); err != nil {
 		return fmt.Errorf("print command failed: %v", err)
 	}
 
-	for y := 0; y < lines; y++ {
-		slice := pixels[y*bytesPerLine : (y+1)*bytesPerLine]
-		reversed := make([]byte, bytesPerLine)
-		for i := 0; i < bytesPerLine; i++ {
-			reversed[i] = reverseBitsInByte(slice[i])
-		}
-	
-		err := client.WriteCharacteristic(dataChr, reversed, true)
-		if err != nil {
-			return fmt.Errorf("line %d write failed: %v", y, err)
-		}
-		time.Sleep(6 * time.Millisecond)
+	bytesPerLine := linePixels / 8
+	if mode == Mode4bpp {
+		bytesPerLine = linePixels / 2
 	}
 
-	cmd = buildCommand(0xAD, []byte{0x00}) // flush
-	err = client.WriteCharacteristic(printChr, cmd, true)
-	if err != nil {
+	mtu := 20
+	for y := 0; y < height; y++ {
+		slice := pixels[y*bytesPerLine : (y+1)*bytesPerLine]
+		for offset := 0; offset < len(slice); offset += mtu {
+			end := offset + mtu
+			if end > len(slice) {
+				end = len(slice)
+			}
+			chunk := slice[offset:end]
+			if err := client.WriteCharacteristic(dataChr, chunk, true); err != nil {
+				return fmt.Errorf("line %d chunk write failed: %v", y, err)
+			}
+			time.Sleep(6 * time.Millisecond)
+		}
+	}
+
+	cmd = buildCommand(0xAD, []byte{0x00})
+	if err := client.WriteCharacteristic(printChr, cmd, true); err != nil {
 		return fmt.Errorf("flush failed: %v", err)
 	}
 
 	return nil
 }
 
+func padImageToMinLines(img image.Image, minLines int) image.Image {
+	bounds := img.Bounds()
+	if bounds.Dy() >= minLines {
+		return img
+	}
+	// Create a new white image
+	dst := imaging.New(bounds.Dx(), minLines, color.White)
+	// Paste the original image at the top
+	dst = imaging.Paste(dst, img, image.Pt(0, 0))
+	return dst
+}
+
+func sendSimpleCommand(client ble.Client, printChr *ble.Characteristic, cmdId byte) error {
+	cmd := buildCommand(cmdId, []byte{0x00})
+	return client.WriteCharacteristic(printChr, cmd, true)
+}
+
+func sendLineCommand(client ble.Client, printChr *ble.Characteristic, cmdId byte, lines uint) error {
+	param := []byte{byte(lines & 0xFF), byte(lines >> 8)}
+	cmd := buildCommand(cmdId, param)
+	return client.WriteCharacteristic(printChr, cmd, true)
+}
+
+func renderPreviewFrom1bpp(pixels []byte, width, height int) image.Image {
+	img := image.NewGray(image.Rect(0, 0, width, height))
+	for y := 0; y < height; y++ {
+		for x := 0; x < width; x++ {
+			idx := (y*width + x) / 8
+			bit := uint(x % 8)
+			if pixels[idx]&(1<<bit) != 0 {
+				img.SetGray(x, y, color.Gray{Y: 0})
+			} else {
+				img.SetGray(x, y, color.Gray{Y: 255})
+			}
+		}
+	}
+	return img
+}
+
+func renderPreviewFrom4bpp(pixels []byte, width, height int) image.Image {
+	img := image.NewGray(image.Rect(0, 0, width, height))
+	for y := 0; y < height; y++ {
+		for x := 0; x < width; x++ {
+			idx := (y*width + x) >> 1
+			shift := uint(((x & 1) ^ 1) << 2)
+			val := (pixels[idx] >> shift) & 0x0F
+			gray := 255 - val*17
+			img.SetGray(x, y, color.Gray{Y: gray})
+		}
+	}
+	return img
+}
 
 func main() {
-	if len(os.Args) < 2 {
-		fmt.Println("Usage: catprinter-ble <image_path>")
+	flag.Parse()
+
+	needNotifications := getStatus || getBattery || getVersion || getPrintType || getQueryCount || ejectPaper > 0 || retractPaper > 0
+
+	if needNotifications {
+		ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
+		defer stop()
+
+		d, err := linux.NewDevice()
+		if err != nil {
+			log.Fatalf("Failed to open BLE device: %v", err)
+		}
+		ble.SetDefaultDevice(d)
+
+		log.Println("Scanning for printer...")
+		log.Println("Connecting...")
+		var adv ble.Advertisement
+		ctxScan, cancel := context.WithTimeout(ctx, scanTimeout)
+		err = ble.Scan(ctxScan, false, func(a ble.Advertisement) {
+			if a.LocalName() == targetPrinterName {
+				adv = a
+				cancel()
+			}
+		}, nil)
+		if err != nil && err != context.Canceled {
+			log.Fatalf("Scan error: %v", err)
+		}
+		if adv == nil {
+			log.Println("Printer not found.")
+			return
+		}
+
+		client, err := ble.Dial(ctx, adv.Addr())
+		if err != nil {
+			log.Fatalf("Connect failed: %v", err)
+		}
+		defer client.CancelConnection()
+
+		mtu, err := client.ExchangeMTU(100)
+		if err != nil {
+			log.Printf("MTU negotiation failed: %v", err)
+		} else {
+			log.Printf("Negotiated ATT MTU: %d", mtu)
+		}
+		var printChr, notifyChr *ble.Characteristic
+		services, err := client.DiscoverServices([]ble.UUID{mainServiceUUID})
+		if err != nil || len(services) == 0 {
+			log.Fatalf("Service discovery failed: %v", err)
+		}
+		svc := services[0]
+		chars, err := client.DiscoverCharacteristics(nil, svc)
+		if err != nil {
+			log.Fatalf("Characteristic discovery failed: %v", err)
+		}
+		for _, c := range chars {
+			switch c.UUID.String() {
+			case notifyCharacteristic.String():
+				notifyChr = c
+			case printCharacteristic.String():
+				printChr = c
+			}
+		}
+		if notifyChr != nil {
+			_, _ = client.DiscoverDescriptors(nil, notifyChr)
+			err = client.Subscribe(notifyChr, false, func(b []byte) {
+				parseNotification(b)
+			})
+			if err != nil {
+				log.Printf("Subscribe failed: %v – notifications will be ignored", err)
+			} else {
+				log.Println("Subscribed to printer notifications.")
+			}
+		}
+		if getStatus {
+			sendSimpleCommand(client, printChr, 0xA1)
+		}
+		if getBattery {
+			sendSimpleCommand(client, printChr, 0xAB)
+		}
+		if getVersion {
+			sendSimpleCommand(client, printChr, 0xB1)
+		}
+		if getPrintType {
+			sendSimpleCommand(client, printChr, 0xB0)
+		}
+		if getQueryCount {
+			sendSimpleCommand(client, printChr, 0xA7)
+		}
+		if ejectPaper > 0 {
+			sendLineCommand(client, printChr, 0xA3, ejectPaper)
+		}
+		if retractPaper > 0 {
+			sendLineCommand(client, printChr, 0xA4, retractPaper)
+		}
+		if getStatus || getBattery || getVersion || getPrintType || getQueryCount || ejectPaper > 0 || retractPaper > 0 {
+			log.Println("Waiting for notifications...")
+			time.Sleep(2 * time.Second)
+		}
+		if flag.NArg() < 1 {
+			return // no image to print, other commands may have run
+		} else if flag.NArg() >= 1 && needNotifications {
+			log.Fatalf("Refusing to print and query at the same time due to a firmware bug. Please run print and query commands separately.")
+		}
+	}
+
+	var printMode PrintMode
+	switch mode {
+	case "1bpp":
+		printMode = Mode1bpp
+	case "4bpp":
+		printMode = Mode4bpp
+	default:
+		fmt.Println("Invalid mode. Use '1bpp' or '4bpp'.")
+		return
+	}
+	imagePath := flag.Arg(0)
+
+	var pixels []byte
+	var height int
+	img, err := decodeImage(imagePath)
+
+	if err != nil {
+		log.Fatalf("Image load error: %v", err)
+	}
+	img = padImageToMinLines(img, minLines)
+
+	switch printMode {
+	case Mode1bpp:
+		pixels, height, err = loadImageMonoFromImage(img, ditherType)
+	case Mode4bpp:
+		pixels, height, err = loadImage4BitFromImage(img, ditherType)
+	}
+	if err != nil {
+		log.Fatalf("Image conversion error: %v", err)
+	}
+
+	if outputPath != "" {
+		var previewImg image.Image
+		switch printMode {
+		case Mode1bpp:
+			previewImg = renderPreviewFrom1bpp(pixels, linePixels, height)
+		case Mode4bpp:
+			previewImg = renderPreviewFrom4bpp(pixels, linePixels, height)
+		}
+		var out io.Writer
+		if outputPath == "-" {
+			out = os.Stdout
+		} else {
+			f, err := os.Create(outputPath)
+			if err != nil {
+				log.Fatalf("Failed to create output file: %v", err)
+			}
+			defer f.Close()
+			out = f
+		}
+		err = imaging.Encode(out, previewImg, imaging.PNG)
+		if err != nil {
+			log.Fatalf("Failed to write PNG preview: %v", err)
+		}
+		if outputPath != "-" {
+			fmt.Printf("Preview PNG written to %s\n", outputPath)
+		}
 		return
 	}
-	imagePath := os.Args[1]
 
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer stop()
@@ -216,9 +616,9 @@ func main() {
 	ble.SetDefaultDevice(d)
 
 	log.Println("Scanning for printer...")
-
+	log.Println("Connecting...")
 	var adv ble.Advertisement
-	ctxScan, cancel := context.WithTimeout(ctx, 10*time.Second)
+	ctxScan, cancel := context.WithTimeout(ctx, scanTimeout)
 	err = ble.Scan(ctxScan, false, func(a ble.Advertisement) {
 		if a.LocalName() == targetPrinterName {
 			adv = a
@@ -233,7 +633,6 @@ func main() {
 		return
 	}
 
-	log.Println("Connecting...")
 	client, err := ble.Dial(ctx, adv.Addr())
 	if err != nil {
 		log.Fatalf("Connect failed: %v", err)
@@ -242,12 +641,11 @@ func main() {
 
 	mtu, err := client.ExchangeMTU(100)
 	if err != nil {
-		log.Printf("MTU negotiation failed, continuing with default MTU. Reason: %v", err)
+		log.Printf("MTU negotiation failed: %v", err)
 	} else {
 		log.Printf("Negotiated ATT MTU: %d", mtu)
 	}
-
-
+	var printChr, dataChr *ble.Characteristic
 	services, err := client.DiscoverServices([]ble.UUID{mainServiceUUID})
 	if err != nil || len(services) == 0 {
 		log.Fatalf("Service discovery failed: %v", err)
@@ -255,23 +653,35 @@ func main() {
 	svc := services[0]
 	chars, err := client.DiscoverCharacteristics(nil, svc)
 	if err != nil {
-		log.Fatalf("Char discovery failed: %v", err)
+		log.Fatalf("Characteristic discovery failed: %v", err)
 	}
-
-	var printChr, dataChr *ble.Characteristic
 	for _, c := range chars {
 		switch c.UUID.String() {
-		case printCharacteristic.String():
-			printChr = c
 		case dataCharacteristic.String():
 			dataChr = c
+		case printCharacteristic.String():
+			printChr = c
 		}
 	}
-	if printChr == nil || dataChr == nil {
-		log.Fatalf("Required characteristics missing")
+
+	if printChr == nil {
+		log.Fatalf("Missing required print characteristic")
 	}
 
-	err = sendImageToPrinter(client, dataChr, printChr, imagePath)
+	i := intensity
+	if i < 0 {
+		i = 0
+	}
+	if i > 100 {
+		i = 100
+	}
+	intensityByte := byte(i)
+
+	if dataChr == nil {
+		log.Fatalf("Missing required data characteristic")
+	}
+
+	err = sendImageBufferToPrinter(client, dataChr, printChr, pixels, height, printMode, intensityByte)
 	if err != nil {
 		log.Fatalf("Failed to print image: %v", err)
 	}
@@ -292,42 +702,41 @@ func buildCommand(cmdId byte, payload []byte) []byte {
 
 func calculateCRC8(data []byte) byte {
 	table := [256]byte{
-            0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
-            0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
-            0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
-            0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
-            0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
-            0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
-            0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
-            0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
-            0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
-            0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
-            0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
-            0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
-            0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
-            0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
-            0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
-            0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
-            0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
-            0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
-            0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
-            0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
-            0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
-            0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
-            0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
-            0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
-            0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
-            0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
-            0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
-            0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
-            0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
-            0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
-            0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
-            0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3}
+		0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
+		0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
+		0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
+		0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
+		0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
+		0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
+		0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
+		0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
+		0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
+		0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
+		0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
+		0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
+		0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
+		0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
+		0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
+		0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
+		0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
+		0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
+		0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
+		0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
+		0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
+		0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
+		0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
+		0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
+		0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
+		0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
+		0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
+		0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
+		0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
+		0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
+		0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
+		0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3}
 	crc := byte(0)
 	for _, b := range data {
 		crc = table[crc^b]
 	}
 	return crc
 }
-