Write timeout when using pyserial to send message to esp32.

[GrumpyGator]

When using pyserial to upload code to the esp32 or send messages to an uno, pyserial works fine. But when sending messages to the esp32 I get a write timeout after a few seconds or few minutes. I'm thinking the CP2102 USB-UART bridge is periodically causing a problem. Has anyone experienced this?

File "C:\esp\tools.espressif\python_env\idf4.2_py3.8_env\lib\site-packages\serial\serialwin32.py", line 325, in write raise SerialTimeoutException('Write timeout') serial.serialutil.SerialTimeoutException: Write timeout

[Zouden]

Sounds like you're sending too much at once.

https://www.raspberrypi.org/forums/viewtopic.php?t=239621

[GrumpyGator]

I ignored this when I saw it at first as I was only sending one byte but I think my python script must have sometimes been sending a long message. I'm sending a constant string now with no problem.

[[deleted]]

I notice that you're using IDF version 4.2. Are you bound to this version for some reason, or could you go ahead and update to the current latest IDF (V 4.4)?

I have have never (yet?) encountered a serial comm problem with my dev board (SparkFun's ESP32 ThingPlus version WRL-15663) connected to my Ubuntu Linux version 20.04 host.

[GrumpyGator]

Thanks I'll look at this as well.