Fabian

> Also, I tried to update esp-idf firmware to 4.2 with at lib, after that, the program crash at at_interface_init(); > 4.2 has a important feature modbus. You can disable...

I have the same issue. The UART Ringbuffer lost data. Even, if i decrease the Baudrate to 115.200! **My Version** > ESP8285 > AT version:2.2.0.0-dev(7963ea8 - ESP8266 - Aug 25...

My Workaround for it: My Host splits the 2048 byte package into 128 byte chunks and added a delay of 3ms between all chunks.

@cgilis How did you extract your token from the S7?