[mosq]: Added TLS transport to mosquitto port

[david-cermak]

• Using ESP-TLS to implement mosq__net.c

[euripedesrocha]

Question: How is the client authentication handled?

[david-cermak]

Question: How is the client authentication handled?

Using esp-tls when accepting a connection:

esp-protocols/components/mosquitto/port/net__esp_tls.c

Lines 115 to 136 in 99bb0f0

	// Finds first free spot in the context array
	int ctx;
	for (ctx = 0; ctx < MAX_CONNECTIONS; ++ctx) {
	if (tls_ctx[ctx].sock == INVALID_SOCKET) {
	tls_ctx[ctx].sock = new_sock;
	tls_ctx[ctx].tls = esp_tls_init();
	if (!tls_ctx[ctx].tls) {
	log__printf(NULL, MOSQ_LOG_ERR, "Faled to create a new ESP-TLS context");
	return NULL;
	}
	break;
	}
	}
	if (ctx >= MAX_CONNECTIONS) {
	log__printf(NULL, MOSQ_LOG_ERR, "Unable to create new ESP-TLS connection. Try increasing \"MAX_CONNECTIONS\"");
	return NULL;
	}
	int ret = esp_tls_server_session_create(tls_cfg, new_sock, tls_ctx[ctx].tls);
	if (ret != 0) {
	log__printf(NULL, MOSQ_LOG_ERR, "Unable to create new ESP-TLS session");
	return NULL;
	}

[david-cermak]

Question: How is the client authentication handled?

Add a link to ESP-TLS docs for more details on specific TLS configs