Trying to take a char[] and append to it.

Projects Programming
1

I am using a twitter library to send out tweets, I think though twitter flips out now if its the same message, so I figured I could create a message with a millis stamp to make it unique and then send that out. though something is not working out. this is my code:

  char msg[] = "Garage Door is OPEN";

int millisRollover() {
  // get the current millis() value for how long the microcontroller has been running
  //
  // To avoid any possiblity of missing the rollover, we use a boolean toggle that gets flipped
  //   off any time during the first half of the total millis period and
  //   then on during the second half of the total millis period.
  // This would work even if the function were only run once every 4.5 hours, though typically,
  //   the function should be called as frequently as possible to capture the actual moment of rollover.
  // The rollover counter is good for over 35 years of runtime. --Rob Faludi http://rob.faludi.com
  //
  static int numRollovers=0; // variable that permanently holds the number of rollovers since startup
  static boolean readyToRoll = false; // tracks whether we've made it halfway to rollover
  unsigned long now = millis(); // the time right now
  unsigned long halfwayMillis = 17179868; // this is halfway to the max millis value (17179868)

  if (now > halfwayMillis) { // as long as the value is greater than halfway to the max
    readyToRoll = true; // you are ready to roll over
  }

  if (readyToRoll == true && now < halfwayMillis) {
    // if we've previously made it to halfway
    // and the current millis() value is now _less_ than the halfway mark
    // then we have rolled over
    numRollovers = numRollovers++; // add one to the count the number of rollovers
    readyToRoll = false; // we're no longer past halfway
  } 
  return numRollovers;
}

int ts = millisRollover();
call with sendTweet(ts);
void sendtweet(int ts)
{
 String theMsg = msg;
 
 theMsg.concat("time:" + ts);
 char msg2[theMsg.length()];
 theMsg.toCharArray(msg2, theMsg.length());
 if (twitter.post(msg2)) {
    ... 
 }
}

So the messages that get sent out have no stamp to them just the msg, am I misusing toCharArray?

2

theMsg.concat("time: ", + ts);

I'm not sure how you add a const char array to an integer. Maybe the complier doesn't know either.

3

Yah I guess what I am wanting to do is non trivial. I just want to tweet a message with a unique ID on it so I stop getting a 403 forbidden from the twitter library.

Thought appending the millis to the message would give me that.

4

Thought appending the millis to the message would give me that.

It would if you were doing it right.

char buffer[20];
sprintf(buffer, "time: %d", ts);
 String theMsg = msg;
 
 theMsg.concat(buffer);