Add an mqtt object to the Monitor object

src/zm_monitor.h

@@ -28,6 +28,7 @@
 #include "zm_event.h"
 #include "zm_fifo.h"
 #include "zm_image.h"
+#include "zm_mqtt.h"
 #include "zm_packet.h"
 #include "zm_packetqueue.h"
 #include "zm_utils.h"
@@ -492,6 +493,8 @@ protected:
 
   std::vector<Zone> zones;
 
+  std::unique_ptr<MQTT> mqtt;
+
   const unsigned char  *privacy_bitmask;
 
   int      n_linked_monitors;