fix mqtt non-terminated strings

src/network/XD0MQTT.cpp

@@ -60,13 +60,15 @@ esp_err_t XD0MQTT::mqtt_event_handler_cb(esp_mqtt_event_handle_t event)
             ESP_LOGI(TAG, "TOPIC=%.*s\r\n", event->topic_len, event->topic);
             ESP_LOGI(TAG, "DATA=%.*s\r\n", event->data_len, event->data);
             for (const auto &subscription : subscriptions_) {
+              char topic[128];
+              strncpy(topic, event->topic, event->topic_len); topic[event->topic_len] = '\0';
               // literal match
-              if (strcmp(event->topic, subscription.topic) == 0) {
+              if (event->topic_len == strlen(subscription.topic) && strncmp(event->topic, subscription.topic, event->topic_len) == 0) {
-                subscription.cb(event->topic, event->data);
+                subscription.cb(topic, event->data, event->data_len);
               // '#' wildcard
               } else if (subscription.topic[strlen(subscription.topic)-1] == '#'){
-                if (strncmp(event->topic, subscription.topic, strlen(subscription.topic)-1) == 0) {
+                if (event->topic_len >= strlen(subscription.topic) && strncmp(event->topic, subscription.topic, strlen(subscription.topic)-1) == 0) {
-                  subscription.cb(event->topic, event->data);
+                  subscription.cb(topic, event->data, event->data_len);
                 }
               }
               // ToDo: '+' wildcard
@@ -128,6 +130,10 @@ void XD0MQTT::end(void) {
   esp_mqtt_client_destroy(client);
 }
 
+bool XD0MQTT::isConnected(void) {
+  return connected;
+}
+
 bool XD0MQTT::publish(const char* topic, const char* data, int len, int qos, int retain) {
   int msg_id = esp_mqtt_client_publish(client, topic, data, len, qos, retain);
   ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);

src/network/XD0MQTT.h

@@ -17,7 +17,7 @@
 
 #include "mqtt_client.h"
 
-typedef std::function<void(char*, char*)> cb_t;
+typedef std::function<void(char*, char*, int)> cb_t;
 
 struct subscription_t {
   const char* topic;
@@ -37,9 +37,10 @@ class XD0MQTT {
     bool subscribe(const char* topic, const cb_t &cb, int qos=1);
     bool unsubscribe(const char* topic);
     esp_err_t mqtt_event_handler_cb(esp_mqtt_event_handle_t event);
-    bool connected = false;
+    bool isConnected(void);
     std::vector<subscription_t> subscriptions_;
   private:
+    bool connected = false;
     // openssl s_client -showcerts -connect home.xd0.de:8883 </dev/null 2>/dev/null|openssl x509 -outform PEM >mqtt_xd0.de.pem
     const char* rootCACertificate = \
       "-----BEGIN CERTIFICATE-----\n" \