David Cermak 391d7bf271 tcp_transport: Add TCP transport connection errors
Transport's error_handle is used to capture different types of errors
including esp_err_t from esp-tls and socket/system errors.
This change adds the following error codes for TCP transport:
* connection closed by a FIN flag (clean closure from server)
* DNS resolution problem
* connection timeout
These errors are already defined in esp-tls component and since this
component will be used in the future for both TCP and SSL transport, we
currently report these issues in transport::error_handle::esp_tls_last_error
of standard esp error type (esp_err_t)

Closes https://github.com/espressif/esp-mqtt/issues/182
2021-02-16 09:00:43 +01:00
..