title: how to cast int from int[] to const char*
body: <p>like the topic mention.... for example</p>
  
  <pre><code>int[10] msg;
  
  msg[0] = 1;
  msg[1] = 2;
  
  const char* a = (const char*)msg[0];      
  const char* b = (const char*)msg[1];
  </code></pre>
  
  <p>It seem there is no value when I test by printf</p>
  
  <p>I'm going to use it this way</p>
  
  <pre><code>char test[20];
  strcpy(test, a);
  strcat(test, ",");
  strcat(test, b);
  strcat(test, "\0");
  mclient.publish("topic1/sensorAck",test);
  </code></pre>
  
  <p>The result show only comma</p>