Error with transport when copying file with mpremote and v1.26 previews #17465

bixb922 · 2025-06-09T14:14:19Z

bixb922
Jun 9, 2025

I always get this error when copying a larger binary file with mpremote to a ESP32-S3:

mpremote cp binary.10000 :/
cp binary.10000 :/
 ... copying  15% [###-----------------]mpremote: Error with transport:
Traceback (most recent call last):
  File "<stdin>", line 1
SyntaxError: invalid syntax

The error occurs with v1.26.0-preview.158.g5cfafb73d and all later 1.26 previews up to v1.26.0-preview.196.g5f058e986.

I have tested with mpremote 1.25.0 installed with pip. I cloned the MicroPython repository and tested running tools/mpremote.py to get the latest version (i.e. the version that supports fs tree) and the problem persists.

I have tried with no name brand ESP32-S3, with WEACT and with VCC-GND ESP32-S3, both N8R8 and N8R16 and the error occurs on all these microcontrollers.

The error does not occur with MicroPython images version 1.25.0 nor 1.24.1, with mpremote 1.24.0 and 1.25.0 (pip installed) on those same microcontrollers.

With smaller binary files, the error is less frequent. The test file is produced by this code:

b=bytearray(10000)
for i in range(len(b)):
	b[i]=i%255
with open("binary.10000", "wb") as file:
	file.write(b)

No music with v1.26.0 previews 😭

Any thoughts?

(edit) These tests were done on a Mac with OS Sonoma version 14.6.1 and using the USB port of the ESP32-S3.

(edit) The error occurs always in the situation I described.

(edit) Could someone please confirm that this happens elsewhere too?

ricksorensen · 2025-06-11T21:26:02Z

ricksorensen
Jun 11, 2025

Works on my S3

$ mpremote cp binary.10000 :/
cp binary.10000 :/
$ mpremote cp binary.10000 :/
cp binary.10000 :/
Up to date: ./binary.10000
rick@ricklinux2:~$ mpremote rm :binary.10000
rm :binary.10000
rick@ricklinux2:~$ mpremote cp binary.10000 :/
cp binary.10000 :/
rick@ricklinux2:~$ mpremote --version   
mpremote 1.25.0

$mpremote
>>> 
MPY: soft reboot
MicroPython v1.26.0-preview.218.g2ce63b142 on 2025-06-10; Generic ESP32S3 module with Octal-SPIRAM with ESP32S3
Type "help()" for more information.
>>> import os
>>> os.listdir()
['audiograb.py', 'binary.10000', 'boot.py', 'doexper.py', 'dosdcard.py', 'lib', 'myconfig.py', 'onlyi2s.py', 'recordnf_16k.py', 'wavtool.py']
>>>

Seeed XIAO ESP32S3

--- Sys Info ---
  platform:        esp32
  version:         3.4.0; MicroPython v1.26.0-preview.218.g2ce63b142 on 2025-06-10
  implementation:  (name='micropython', version=(1, 26, 0, 'preview'), _machine='Generic ESP32S3 module with Octal-SPIRAM with ESP32S3', _mpy=11014, _build='ESP32_GENERIC_S3-SPIRAM_OCT')
  build:           MicroPython-1.26.0-preview-xtensa-IDFv5.4.1-with-newlib4.3.0

--- / FileSyst: Size=6291456   Free=6213632   Type: vfs
gc_free: 8317680

0 replies

bixb922 · 2025-06-12T04:19:53Z

bixb922
Jun 12, 2025
Author

Thank you very much!

It seems you tested with Linux, is that right? I have problems with Mac only. With Windows everything works ok.

0 replies

bixb922 · 2025-06-12T17:48:03Z

bixb922
Jun 12, 2025
Author

Some progress here. I changed chunk_size from 256 to 15 in mpremote.transport.fs_writefile() and now mpremote works correctly (most of the time).
chunk_size>=16 fails. This is a bit slower, but at least it works and I can upgrade to v1.26 with some difficulties, since the problem is present.

0 replies

bixb922 · 2025-06-14T15:26:48Z

bixb922
Jun 14, 2025
Author

Still not much progress here. To transfer large files, I need to set chunk size to 4. This makes mpremote very slow for v.1.26 previews and almost impossible to use.

No problems with Windows (same cables, same microcontrollers, same versions) nor with v1.25 and prior.

I'd appreciate it very much if someone could reproduce the problem: Mac with OS Sonoma version 14.6.1 and using the USB port of the ESP32-S3, transferring larger binary files (10000 bytes), version 1.26 preview 158 and up.

3 replies

adzierzanowski Jun 25, 2025

I've reproduced a very similar thing on Sequoia #17560 but I couldn't find what causes the issue

bixb922 Jun 26, 2025
Author

Thank you!

bixb922 Jun 29, 2025
Author

See #17560 for an update

MicroPython

Error with transport when copying file with mpremote and v1.26 previews #17465

Uh oh!

Uh oh!

bixb922 Jun 9, 2025

Replies: 4 comments · 3 replies

Uh oh!

ricksorensen Jun 11, 2025

Uh oh!

bixb922 Jun 12, 2025 Author

Uh oh!

Uh oh!

bixb922 Jun 12, 2025 Author

Uh oh!

bixb922 Jun 14, 2025 Author

Uh oh!

adzierzanowski Jun 25, 2025

Uh oh!

bixb922 Jun 26, 2025 Author

Uh oh!

bixb922 Jun 29, 2025 Author

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bixb922
Jun 9, 2025

Replies: 4 comments 3 replies

ricksorensen
Jun 11, 2025

bixb922
Jun 12, 2025
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bixb922
Jun 12, 2025
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bixb922
Jun 14, 2025
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bixb922 Jun 26, 2025
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bixb922 Jun 29, 2025
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