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391d7bf271
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