[nrf noup] net: mqtt: add native TLS support

Make MQTT `set_native_tls` option work w/o socket dispatcher enabled.

Signed-off-by: Mirko Covizzi <[email protected]>
Signed-off-by: Robert Lubos <[email protected]>
(cherry picked from commit bc09473)

Author: MirkoCovizzi

subsys/net/lib/mqtt/mqtt_transport_socket_tls.c

@@ -22,10 +22,15 @@ int mqtt_client_tls_connect(struct mqtt_client *client)
 {
 	const struct sockaddr *broker = client->broker;
 	struct mqtt_sec_config *tls_config = &client->transport.tls.config;
+	int type = SOCK_STREAM;
 	int ret;
 
+	if (!IS_ENABLED(CONFIG_NET_SOCKETS_OFFLOAD_DISPATCHER) && tls_config->set_native_tls) {
+		type |= SOCK_NATIVE_TLS;
+	}
+
 	client->transport.tls.sock = zsock_socket(broker->sa_family,
-						  SOCK_STREAM, IPPROTO_TLS_1_2);
+						  type, IPPROTO_TLS_1_2);
 	if (client->transport.tls.sock < 0) {
 		return -errno;
 	}