As abreaking change, by default a error handler is built into the MQTT.js client, so if any errors are emitted and the user has not created an event handler on the client for errors, the client will not break as a result of unhandled errors. Additionally, typical TLS errors likeECONNRE...
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MQTTClient.error_register_cb(callback) Sets the callback function of error occurrence. When the MQTT internal thread is abnormal, the error message is returned by the callback function. The callback function can be called only when the internal reconnection is not enabled. ...
* For subscribers registering a new subscription, the flag being true * indicates that the received message is not a new one, but one that has * been retained by the MQTT server. * * <b>retained = false</b> <br> * For publishers, this indicates that this message should not be ...
It was designed as an extremely lightweight publish/subscribe messaging transport. It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium. For example, it has been used in sensors communicating to a broker via satellit...
emqtt pubis used to publish a single message on a topic and exit.emqtt subis used to subscribe to a topic and print the messages that it receives. Command-line Syntax Options can have both short (single character) and long (string) option names. ...
attr.cb_size = 0U; attr.stack_mem = NULL; attr.stack_size = 2048; attr.priority = osThreadGetPriority(osThreadGetId()); rc = (int)osThreadNew((osThreadFunc_t)fn, arg, &attr); return rc; } void TimerInit(Timer* timer) ...
{ /* Call an 'A' function... */ } else { printf("mqtt_incoming_data_cb: Ignoring payload...\n"); } } else { /* Handle fragmented payload, store in buffer, write to file or whatever */ } } static void mqtt_sub_request_cb(void *arg, err_t result) { printf("Subscribe ...
Then, the callback function for the PUB connection. Note that mqtt_pub_request_cb is the callback function after publish is completed. static void mqtt_pub_connection_cb(mqtt_client_t *client, void *arg, mqtt_connection_status_t status) { if (status == MQTT_CONNECT_ACCEPTED) { printf(...
= 0){ printf("Return code from MQTT publish is %d\n", rc); NetworkDisconnect(&network); MQTTDisconnect(&client); goto begin; } osDelay(50); } } static void MQTT_Demo(void) { osThreadAttr_t attr; = "MQTT_DemoTask"; attr.attr_bits = 0U; attr.cb_mem = NULL; attr.cb_size...