ESP32 Forum

PPP strange behaveour

Hi !

I try to use GSM modem trough PPP mode.

Modem connected ok.

netif is established ok.

ppp connection is setup ok.

after that tcp socket has worked correctly some time. It recieves and send some data.
but after some length of data it returns error.


The similar tcp connection over wifi works correctly.


I (81546) TCP_CLIENT: Sending 64 bytes
I (81556) TCP_CLIENT: Sending 64 bytes
I (81566) TCP_CLIENT: Sending 64 bytes
I (81576) TCP_CLIENT: Sending 64 bytes
I (81586) TCP_CLIENT: Sending 64 bytes
I (81596) TCP_CLIENT: Sending 64 bytes
I (81606) TCP_CLIENT: Sending 64 bytes
I (81616) TCP_CLIENT: Sending 64 bytes
E (81616) TCP_CLIENT: Error occurred during sending: errno 11
I (81626) TCP_CLIENT: Sending 64 bytes
E (81626) TCP_CLIENT: Error occurred during sending: errno 11
I (81636) TCP_CLIENT: Sending 64 bytes
E (81636) TCP_CLIENT: Error occurred during sending: errno 11
I (81646) TCP_CLIENT: Sending 64 bytes
E (81646) TCP_CLIENT: Error occurred during sending: errno 11
I (81656) TCP_CLIENT: Sending 64 bytes
E (81656) TCP_CLIENT: Error occurred during sending: errno 11


What it can be? It seems that some buffers in the stack are overflowed.

Thanks for helping and any advice!

BR. Dmitry.