Enable MQTTS on esp client and remove useless folder

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

@@ -177,11 +177,55 @@ static void mqtt_event_handler(void *handler_args, esp_event_base_t base, int32_
     }
 }
 
+static const char *root_ca_pem = 
+"-----BEGIN CERTIFICATE-----\n"
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+"-----END CERTIFICATE-----\n";
+
 static esp_mqtt_client_handle_t client = NULL;
 void mqtt_init(void)
 {
     esp_mqtt_client_config_t mqtt_cfg = {
-        .broker.address.uri = "mqtt://192.168.15.119:1883",
+        .broker = {
+            .address.uri = "mqtts://192.168.15.119:8883",
+            .verification = {
+                .certificate = root_ca_pem,
+                .certificate_len = 0,
+                .skip_cert_common_name_check = false,
+            }
+        },
         .credentials = {
             .username = "device",
             .authentication = {
@@ -215,7 +259,7 @@ void send_gps_data(const char *topic, const char *json)
         return;
     }
 
-    int msg_id = esp_mqtt_client_publish(client, topic, json, 0, 1, 0);
+    int msg_id = esp_mqtt_client_publish(client, topic, json, 0, 2, 0);
     if (msg_id < 0) {
         ESP_LOGE(TAG, "Failed to publish GPS");
     } else {