I also use the BT classic, but never met data loss. Maybe you can connect the UART CTS, RTS, enable the UART flow control and try it again. To see if it is the UART that lost data. Thanks for reply i'm doing the test from PC, without RTS or CTS, but the problem, for me, isnt' rts o cts, because at ...

Hi, i'm trying to use BT Classic by AT Command, on esp32-pico-d4. I'm using spp connection, i receive byte but i lose many byte, this is what happen: This i right, i receive 3 byte (1D 49 03) seguito dallo 0d 0a 2B 42 54 44 41 54 41 3A 33 2C 1D 49 03 0D 0A -->> +BTDATA:3,.I... this is wrong: 2B 42 5...