ESP32 Forum

Hi,

We have device which should be able to communicate with cloud via WiFi and external modem (connected to uart), if WiFi connection is unavailable. Of course using TLS connection.
Is possible to change (programically) driver from wifi to custom eg. in esp_tls_conn_new command?
Or whether is possible to use integrated mBedTLS for establish TLS connection via external LTE modem ?

Thanks.

Best regards,
Andrzej T.

Hi,

No one tried establish TLS connection using external LTE modem?
So I assume, that no answer means that it is impossible.

Regards,
Andrzej T.

If modem integrates to lwip as netif then higher level protocols should work normally

Yes, you can use PPPoS (PPP over serial) with most cellular modems. The same LWIP network stack is used, so the modem connection can be used the same way that a Wi-Fi or Ethernet connection would be used.

Take a look at this example (the README has a lot of explanation):
https://github.com/espressif/esp-idf/tr ... pos_client

There is some difference between cellular modems. If you don't use of the modems mentioned in the example README then you may need to tweak the code a bit.

Thanks a lot.
This is exactly what I need.

Regards,
Andrzej T.