I found a solution that works for me in Arduino IDE ESP32-C3 USB CDC problems · Issue #6089 · espressif/arduino-esp32 · GitHub, in battery mode Serial.begin must be commented out, then everything works.
Have my XIAO ESP32C3 board now 72 hours in battery mode with no errors.XIAO ESP32C3 board Starts up, sends sensor data to my server via MQTT goes into Deep Sleep for 120 seconds, wakes up again and sends, goes to sleep…I am starting a long term test to see, how long this sensor can run with a 16850 cell.The battery voltage and the values from a BME280 are transmitted. Greetings italschwob.
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