GPRS or Edge Howto?

I think the problem is within the AT lib. It just handles lines which end with \r\n. On the SIM900 you have to wait for "> " before sending the data after sending AT+CIPSEND=...

The "> " is not ending with \r\n therefore it is not sent back to the callback provided to at.cmd()

My send method currently looks like this:

  send : function(sckt, data) {
    if (at.isBusy() || socks[sckt]=="Wait" || sockBusy[sckt]) return 0;
    if (!socks[sckt]) return -1; // error - close it
    sockBusy[sckt] = true;

    var cb = function(r) {
      at.debug();
      console.log('-->' + JSON.stringify(r));
      return cb;
    };
    sockSent[sckt] += data.length;
    console.log('Send '+ data.length + ': ' + JSON.stringify(data));
    console.log('Total: ' + sockSent[sckt]);
    at.cmd('AT+CIPSEND='+sckt+','+data.length+'\r\n', 3000, cb);
    return sockSent[sckt];
  }