mqtt: reduce debug log pressure, return result of mqttSend

code/espurna/config/prototypes.h

@@ -204,8 +204,8 @@ String mqttTopic(const char * magnitude, unsigned int index, bool is_set);
 
 String mqttMagnitude(char * topic);
 
-void mqttSendRaw(const char * topic, const char * message, bool retain);
-void mqttSendRaw(const char * topic, const char * message);
+bool mqttSendRaw(const char * topic, const char * message, bool retain);
+bool mqttSendRaw(const char * topic, const char * message);
 
 void mqttSend(const char * topic, const char * message, bool force, bool retain);
 void mqttSend(const char * topic, const char * message, bool force);

code/espurna/mqtt.ino

@@ -640,25 +640,34 @@ String mqttTopic(const char * magnitude, unsigned int index, bool is_set) {
 
 // -----------------------------------------------------------------------------
 
-void mqttSendRaw(const char * topic, const char * message, bool retain) {
+bool mqttSendRaw(const char * topic, const char * message, bool retain) {
 
-    if (_mqtt.connected()) {
+    if (!_mqtt.connected()) return false;
+
+    const unsigned int packetId(
         #if MQTT_LIBRARY == MQTT_LIBRARY_ASYNCMQTTCLIENT
-            unsigned int packetId = _mqtt.publish(topic, _mqtt_qos, retain, message);
-            DEBUG_MSG_P(PSTR("[MQTT] Sending %s => %s (PID %d)\n"), topic, message, packetId);
+            _mqtt.publish(topic, _mqtt_qos, retain, message)
         #elif MQTT_LIBRARY == MQTT_LIBRARY_ARDUINOMQTT
-            _mqtt.publish(topic, message, retain, _mqtt_qos);
-            DEBUG_MSG_P(PSTR("[MQTT] Sending %s => %s\n"), topic, message);
+            _mqtt.publish(topic, message, retain, _mqtt_qos)
         #elif MQTT_LIBRARY == MQTT_LIBRARY_PUBSUBCLIENT
-            _mqtt.publish(topic, message, retain);
-            DEBUG_MSG_P(PSTR("[MQTT] Sending %s => %s\n"), topic, message);
+            _mqtt.publish(topic, message, retain)
         #endif
+    );
+
+    const size_t message_len = strlen(message);
+    if (message_len > 128) {
+        DEBUG_MSG_P(PSTR("[MQTT] Sending %s => (%u bytes) (PID %u)\n"), topic, message_len, packetId);
+    } else {
+        DEBUG_MSG_P(PSTR("[MQTT] Sending %s => %s (PID %u)\n"), topic, message, packetId);
     }
+
+    return (packetId > 0);
+
 }
 
 
-void mqttSendRaw(const char * topic, const char * message) {
-    mqttSendRaw (topic, message, _mqtt_retain);
+bool mqttSendRaw(const char * topic, const char * message) {
+    return mqttSendRaw (topic, message, _mqtt_retain);
 }
 
 void mqttSend(const char * topic, const char * message, bool force, bool retain) {