Update MQTT on esp client

esp32-thread/open-thread-client/main/esp_ot_cli.c

@@ -183,7 +183,10 @@ void mqtt_init(void)
     esp_mqtt_client_config_t mqtt_cfg = {
         .broker.address.uri = "mqtt://192.168.15.119:1883",
         .credentials = {
-            .username = NULL,
+            .username = "device",
+            .authentication = {
+                .password = "hepl",
+            },
             .client_id = NULL,
             .set_null_client_id = true
         },
@@ -291,7 +294,7 @@ char* read_gps() {
 
 void send_position_task(void *pvParameters)
 {
-    const char* gps_topic = "/board-mate/gps/notify";
+    const char* gps_topic = "/system/sensor/gps";
 
     while (1) {
         char* json;