mqtt: fixed connect issues.

no works with connectable endpoint code.

aqhome/mqtt/endpoint_mqttc_p.h

@@ -12,6 +12,8 @@
 
 #include "aqhome/mqtt/endpoint_mqttc.h"
 
+#include <gwenhywfar/endpoint_connectable.h>
+
 
 typedef struct AQH_ENDPOINT_MQTTC AQH_ENDPOINT_MQTTC;
 struct AQH_ENDPOINT_MQTTC {
@@ -21,6 +23,7 @@ struct AQH_ENDPOINT_MQTTC {
   uint16_t keepAliveTime;
 
   GWEN_MSG_ENDPOINT_RUN_FN previousRunFn;
+  GWEN_CONN_ENDPOINT_CONNECT_FN previousConnectFn;
 };