Onyx note pro not visible as MTP on Debian 10

Note Series
#1

Hi!

I’m trying to transfer back and fro with my new Onyx reader and my Linux computer. The Onyx is a Note Pro and I tried on two Debian GNU/Linux 10 (“buster”) computers. I can see the device file in my file manager when the USB connection is in PTP mode, but not MTP. I am not sure why, and I seem to remember it did work at one time, but I can’t make it work anymore.

jmtpfs sees the device, strangely:

$ jmtpfs -l
Device 0 (VID=2207 and PID=000d) is UNKNOWN in libmtp v1.1.16.
Please report this VID/PID and the device model to the libmtp development team
Available devices (busLocation, devNum, productId, vendorId, product, vendor):
1, 18, 0x000d, 0x2207, UNKNOWN, UNKNOWN

but badly fails to mount it:

$ jmtpfs mnt
Device 0 (VID=2207 and PID=000d) is UNKNOWN in libmtp v1.1.16.
Please report this VID/PID and the device model to the libmtp development team

PTP_ERROR_IO: failed to open session, trying again after resetting USB interface
LIBMTP libusb: Attempt to reset device
LIBMTP PANIC: failed to open session on second attempt
terminate called after throwing an instance of 'MtpErrorCantOpenDevice'
  what():  Can't open device
Abandon (core dumped)

The backtrace is:

(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007fb645181535 in __GI_abort () at abort.c:79
#2  0x00007fb64556c983 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007fb6455728c6 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007fb645572901 in std::terminate() ()
   from /lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007fb645572b34 in __cxa_throw ()
   from /lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x0000560999952f65 in MtpDevice::MtpDevice (this=0x56099a029630, 
    rawDevice=...) at MtpDevice.cpp:67
#7  0x0000560999954d64 in ConnectedMtpDevices::GetDevice (this=0x7ffd78d64570, 
    index=0) at ConnectedMtpDevices.cpp:56
#8  0x0000560999950164 in main (argc=<optimized out>, argv=<optimized out>)
    at jmtpfs.cpp:447

The crash seems like a bug with jmtpfs which doesn’t handle the failure from libmtp correctly.

It seems there might be a problem with libmtp, as it warns about the device missing from the library. According to the libmtp homepage, it can be fixed by adding the device to the .h header file and recompiling, but I haven’t tried this yet. This is what mtp-detect thinks of the device:

# mtp-detect 
libmtp version: 1.1.16

Listing raw device(s)
Device 0 (VID=2207 and PID=000d) is UNKNOWN in libmtp v1.1.16.
Please report this VID/PID and the device model to the libmtp development team
   Found 1 device(s):
   2207:000d @ bus 1, dev 18
Attempting to connect device(s)
Android device detected, assigning default bug flags
USB low-level info:
   bcdUSB: 512
   bDeviceClass: 0
   bDeviceSubClass: 0
   bDeviceProtocol: 0
   idVendor: 2207
   idProduct: 000d
   IN endpoint maxpacket: 512 bytes
   OUT endpoint maxpacket: 512 bytes
   Raw device info:
      Bus location: 1
      Device number: 18
      Device entry info:
         Vendor: (null)
         Vendor id: 0x2207
         Product: (null)
         Vendor id: 0x000d
         Device flags: 0x18008106
Configuration 0, interface 0, altsetting 0:
   Interface description contains the string "MTP"
   Device recognized as MTP, no further probing.
Device info:
   Manufacturer: Onyx
   Model: NotePro
   Device version: 1.0
   Serial number: ????????
   Vendor extension ID: 0x00000006
   Vendor extension description: microsoft.com: 1.0; android.com: 1.0;
   Detected object size: 64 bits
   Extensions:
        microsoft.com: 1.0
        android.com: 1.0
Supported operations:
   1001: Get device info
   1002: Open session
   1003: Close session
   1004: Get storage IDs
   1005: Get storage info
   1006: Get number of objects
   1007: Get object handles
   1008: Get object info
   1009: Get object
   100a: Get thumbnail
   100b: Delete object
   100c: Send object info
   100d: Send object
   1014: Get device property description
   1015: Get device property value
   1016: Set device property value
   1017: Reset device property value
   101b: Get partial object
   9801: Get object properties supported
   9802: Get object property description
   9803: Get object property value
   9804: Set object property value
   9805: Get object property list
   9810: Get object references
   9811: Set object references
   95c1: Get Partial Object (64bit Offset)
   95c2: Send Partial Object
   95c3: Truncate Object
   95c4: Begin Edit Object
   95c5: End Edit Object
Events supported:
   0x4002: ObjectAdded
   0x4003: ObjectRemoved
   0x4004: StoreAdded
   0x4005: StoreRemoved
   0x4006: DevicePropChanged
Device Properties Supported:
   0xd401: Synchronization Partner
   0xd402: Friendly Device Name
   0x5003: Image Size
   0x5001: Battery Level
Playable File (Object) Types and Object Properties Supported:
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      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
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      dce0: Display Name STRING data type READ ONLY
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   3004: Text
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      dc04: Object Size UINT64 data type READ ONLY
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      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
   3005: HTML
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
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   3008: MS Wave
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
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      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dc8b: Track UINT16 data type ANY 16BIT VALUE form READ ONLY
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      dc8c: Genre STRING data type READ ONLY
      dc96: Composer STRING data type READ ONLY
      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
      de9a: Audio Bit Rate UINT32 data type range: MIN 1, MAX 1536000, STEP 1 READ ONLY
      de94: Number Of Channels UINT16 data type enumeration: 1, 2, 3, 4, 5, 6, 7, 8, 9,  READ ONLY
      de93: Sample Rate UINT32 data type range: MIN 8000, MAX 48000, STEP 1 READ ONLY
   3009: MP3
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
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      dc8c: Genre STRING data type READ ONLY
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      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
      de9a: Audio Bit Rate UINT32 data type range: MIN 1, MAX 1536000, STEP 1 READ ONLY
      de94: Number Of Channels UINT16 data type enumeration: 1, 2, 3, 4, 5, 6, 7, 8, 9,  READ ONLY
      de93: Sample Rate UINT32 data type range: MIN 8000, MAX 48000, STEP 1 READ ONLY
   300b: MPEG
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
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      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
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      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc48: Description STRING data type READ ONLY
   3801: JPEG
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
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      dc48: Description STRING data type READ ONLY
   3802: TIFF EP
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
   3804: BMP
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
      dc48: Description STRING data type READ ONLY
   3807: GIF
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
      dc48: Description STRING data type READ ONLY
   3808: JFIF
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
   380b: PNG
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
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      dc48: Description STRING data type READ ONLY
   380d: TIFF
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
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   b901: WMA
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
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      dc8b: Track UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc99: Original Release Date STRING data type READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc8c: Genre STRING data type READ ONLY
      dc96: Composer STRING data type READ ONLY
      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
      de9a: Audio Bit Rate UINT32 data type range: MIN 1, MAX 1536000, STEP 1 READ ONLY
      de94: Number Of Channels UINT16 data type enumeration: 1, 2, 3, 4, 5, 6, 7, 8, 9,  READ ONLY
      de93: Sample Rate UINT32 data type range: MIN 8000, MAX 48000, STEP 1 READ ONLY
   b902: OGG
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc9b: Album Artist STRING data type READ ONLY
      dc8b: Track UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc99: Original Release Date STRING data type READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc8c: Genre STRING data type READ ONLY
      dc96: Composer STRING data type READ ONLY
      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
      de9a: Audio Bit Rate UINT32 data type range: MIN 1, MAX 1536000, STEP 1 READ ONLY
      de94: Number Of Channels UINT16 data type enumeration: 1, 2, 3, 4, 5, 6, 7, 8, 9,  READ ONLY
      de93: Sample Rate UINT32 data type range: MIN 8000, MAX 48000, STEP 1 READ ONLY
   b903: AAC
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dc04: Object Size UINT64 data type READ ONLY
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      dce0: Display Name STRING data type READ ONLY
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      dc8b: Track UINT16 data type ANY 16BIT VALUE form READ ONLY
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      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc8c: Genre STRING data type READ ONLY
      dc96: Composer STRING data type READ ONLY
      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
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   b982: MP4
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dce0: Display Name STRING data type READ ONLY
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   b983: MP2
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dc07: Object File Name STRING data type GET/SET
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      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
   b984: 3GP
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
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      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
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      dc48: Description STRING data type READ ONLY
   ba05: Abstract Audio Video Playlist
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      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
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      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
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   ba11: M3U Playlist
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
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      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
   ba14: PLS Playlist
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
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      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
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   ba82: XMLDocument
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   b906: FLAC
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      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc4e: Date Added STRING data type READ ONLY
Storage Devices:
   StorageID: 0x00010001
      StorageType: 0x0003 fixed RAM storage
      FilesystemType: 0x0002 generic hierarchical
      AccessCapability: 0x0000 read/write
      MaxCapacity: 60020568064
      FreeSpaceInBytes: 58207645696
      FreeSpaceInObjects: 1073741824
      StorageDescription: Mémoire de stockage interne
      VolumeIdentifier: (null)
Special directories:
   Default music folder: 0xffffffff
   Default playlist folder: 0xffffffff
   Default picture folder: 0xffffffff
   Default video folder: 0xffffffff
   Default organizer folder: 0xffffffff
   Default zencast folder: 0xffffffff
   Default album folder: 0xffffffff
   Default text folder: 0xffffffff
MTP-specific device properties:
   Friendly name: (NULL)
   Synchronization partner: (NULL)
   Battery level 84 of 100 (83%)
libmtp supported (playable) filetypes:
   Folder
   Text file
   HTML file
   RIFF WAVE file
   ISO MPEG-1 Audio Layer 3
   MPEG video stream
   JPEG file
   BMP bitmap file
   GIF bitmap file
   JFIF file
   Portable Network Graphics
   TIFF bitmap file
   Microsoft Windows Media Audio
   Ogg container format
   Advanced Audio Coding (AAC)/MPEG-2 Part 7/MPEG-4 Part 3
   MPEG-4 Part 14 Container Format (Audio+Video Emphasis)
   ISO MPEG-1 Audio Layer 2
   Abstract Playlist file
   XML file
   Free Lossless Audio Codec (FLAC)
Clearing stall on OUT endpoint
OK.
root@curie:/home/anarcat# jmtpfs -l
Device 0 (VID=2207 and PID=000d) is UNKNOWN in libmtp v1.1.16.
Please report this VID/PID and the device model to the libmtp development team
Available devices (busLocation, devNum, productId, vendorId, product, vendor):
1, 18, 0x000d, 0x2207, UNKNOWN, UNKNOWN

And I haven’t tried patching libmtp yet because after fiddling with the device, it’s detected as an MTP device again! What I did, I think, was:

  1. switch from MTP to “charge only” mode
  2. lose the way to set it back to MTP, forget where to find that dialog again (the USB logo was gone from the top bar)
  3. go into “Developer options” (in the Android “Settings” app reachable only through a third-party launcher I installed, not the normal Settings app, which doesn’t have that button), and enable USB debugging
  4. the USB icon returns from the top menu bar, maybe coincidental
  5. re-enable MTP mode
  6. the device shows up again

This is sub-optimal, to say the least. MTP support is not great in linux, but it’s generally not that problematic. This might be a combination of a problem with the Note and a problem in Linux, but I would sure love to hear more about how people are connecting their device on Linux.

A few workarounds I used:

  • use the Wifi transfer app to send files to the device (but it can’t send files back, unless you create an account on send2boox.com which seem to require a wechat or google account, which we don’t have)
  • send files by email through the web browser
  • considered installing syncthing.net to sync a folder on the device (not tested yet)

Alright, any advice welcome.

#2

Similar discussion, about Calibre:

https://www.mobileread.com/forums/showthread.php?t=296401
https://www.mobileread.com/forums/showthread.php?t=320765

The trick there is to add a udev rule for the device:

# Onyx Note https://www.mobileread.com/forums/showthread.php?t=296401
ATTR{idVendor}=="2207", ATTR{idProduct}=="0001", MODE="0664", GROUP="plugdev"
# Onyx Note Pro
ATTR{idVendor}=="2207", ATTR{idProduct}=="000d", MODE="0664", GROUP="plugdev"

in (say) /etc/udev/rules.d/51-android.rules, and reload udev:

sudo udevadm trigger

This thread also refers to using adb to sync files:

https://www.mobileread.com/forums/showthread.php?t=320870

Trick here is:

adb pull /sdcard/Books Books

But it first assumes you have USB debugging enabled.