David Cermak 55d41c3377 esp_modem: Fixed race condition on exiting PPP mode ... esp_modem_stop_ppp() stops both ppp netif and switches the modem back to command mode. IF these two actions are not synchronised, we might experience issues of * active PPP session trying to send/receive uart-data * command mode already active before modem switched to it both resulting in crashes. Fixed by introducing the transition mode and running these actions in sequence * set esp-modem to transition mode * enter command mode, wait for the reply or re-sync * close the PPP netif * wait until the netif closes Other fixes include ignoring certain events if modem component not ready or not in appropriate mode: * ignoring all UART events comming from DTE with no DCE attached * ignore pattern detection in PPP mode Closes https://github.com/espressif/esp-idf/issues/6013 Closes https://github.com/espressif/esp-idf/issues/5737 Closes https://github.com/espressif/esp-idf/issues/6024 Closes https://github.com/espressif/esp-idf/issues/6058 Closes https://github.com/espressif/esp-idf/issues/5563 Closes https://github.com/espressif/esp-idf/issues/5695 Closes https://github.com/espressif/esp-idf/issues/5633 Closes https://github.com/espressif/esp-idf/issues/4482 Related https://github.com/espressif/esp-idf/pull/4849 Related https://github.com/espressif/esp-idf/pull/4653		2020-12-21 16:38:20 +01:00
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modem	esp_modem: Fixed race condition on exiting PPP mode	2020-12-21 16:38:20 +01:00