I am interested to know if you have found the solution to the problem you described as I have the same problem and I cannot find the solution using ISR rx timeout.Thank you.

I have a serial data communication between two ESP32 in SPP bluetooth mode. The master must transmit a sequence of 32 bytes to the slave which, after receiving the data, waits about 1mS and sends the response to the master with a sequence of 32 bytes. This cycle must be repeated over and over. From ...