Make the MQTT client example a little more configurable and verbose

Suitable for native run testing

examples/mqtt-client/mqtt-client.c

@@ -47,7 +47,11 @@
 #include <strings.h>
 /*---------------------------------------------------------------------------*/
 #define LOG_MODULE "mqtt-client"
+#ifdef MQTT_CLIENT_CONF_LOG_LEVEL
+#define LOG_LEVEL MQTT_CLIENT_CONF_LOG_LEVEL
+#else
 #define LOG_LEVEL LOG_LEVEL_NONE
+#endif
 /*---------------------------------------------------------------------------*/
 /* Controls whether the example will work in IBM Watson IoT platform mode */
 #ifdef MQTT_CLIENT_CONF_WITH_IBM_WATSON
@@ -305,6 +309,7 @@ pub_handler(const char *topic, uint16_t topic_len, const uint8_t *chunk,
   }
 
   if(strncmp(&topic[10], "leds", 4) == 0) {
+    LOG_DBG("Received MQTT SUB\n");
     if(chunk[0] == '1') {
       leds_on(LEDS_RED);
     } else if(chunk[0] == '0') {

examples/mqtt-client/project-conf.h

@@ -52,7 +52,9 @@
  * devices, set your Org ID here and then make sure you set the correct token
  * through MQTT_CLIENT_CONF_AUTH_TOKEN.
  */
+#ifndef MQTT_CLIENT_CONF_ORG_ID
 #define MQTT_CLIENT_CONF_ORG_ID "quickstart"
+#endif
 
 /*
  * The MQTT username.