I ended up reinstalling esp-idf from scratch and redoing the code. Since then I haven't had any problems with Modbus.

@ESP_alisitsyn

Since running the commands you suggested I can no longer even build it. Whenever I try to build I get a bunch of errors related to stdatomic.h

Thanks

This is what I got when I ran git log -n 2 # git log -n 2 commit 7504329ef9fb01f01a382416af7453c54b47fb2b (HEAD, origin/release/v4.0) Merge: c2f9002b03 f3f1190959 Author: Jiang Jiang Jian <jack@espressif.com> Date: Fri Jun 25 11:45:15 2021 +0000 Merge branch 'bugfix/fix_amsdu_fragment_vulnerability_...

@ESP_alisitsyn

I couldn't get the file to checkout and trying to apply the attached one gives a bunch of errors saying patch does not apply and a few no such file or directory.

I don't know if it's relevant but mine is so old I'm using msys32 and make (instead of idf.py).

Thanks

@ESP_alisitsyn here is the information

1. v4.0-dev-512-g6fd535c98-dirty

2. 20 registers

3. Attached

4. Yes RS485

Thanks

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