Question
Connect to MQTT Broker with STM32F746G Discovery
Hi, I'm trying to connect to my MQTT Broker with STM32F7 Discovery kit.
Firstly, I used MQTT Client in LwIP stack.
When I call this function: mqtt_client_connect()
the Error return ERR_RTE, mean Routing Error
/** Routing problem. */
ERR_RTE = -4,
So anybody can give me some advice about this problem? I make sure that the IP Address and topic is right.
Many thanks.
Below is my function:
void example_do_connect(mqtt_client_t *client, const char *topic)
{
struct mqtt_connect_client_info_t ci;
err_t err;
/* Setup an empty client info structure */
memset(&ci, 0, sizeof(ci));
/* Minimal amount of information required is client identifier, so set it here */
ci.client_id = "ExampleClientPub";
//ci.client_user = "mosquitto";
//ci.client_pass = "chupasangre"; /* Tiempo en mi caso */
/* Initiate client and connect to server, if this fails immediately an error code is returned
otherwise mqtt_connection_cb will be called with connection result after attempting
to establish a connection with the server.
For now MQTT version 3.1.1 is always used */
ip_addr_t mqttServerIP;
IP4_ADDR(&mqttServerIP, 46, 145, 85, 31);
// err = mqtt_client_connect(client, &mqttServerIP, MQTT_PORT, mqtt_connection_cb, 0, &ci);
err = mqtt_client_connect(client, &mqttServerIP, MQTT_PORT, mqtt_connection_cb, &topic, &ci);
/* For now just print the result code if something goes wrong */
if(err != ERR_OK) {
LCD_UsrLog("mqtt_connect return %d\n", err);
}
else
{
LCD_UsrLog("Connected");
}
}
/* Called when publish is complete either with sucess or failure */
static void mqtt_pub_request_cb(void *arg, err_t result)
{
if(result != ERR_OK) {
printf("Publish result: %d\n", result);
}
}