send callback on startRTM websocket error

Author: abresas

lib/Slackbot_worker.js

@@ -128,15 +128,22 @@ module.exports = function(botkit, config) {
         botkit.shutdown();
     };
 
-    bot.startRTM = function(cb) {
+    bot.startRTM = function(userCb) {
+        var userCbCalled = false;
+        var cb = function() {
+            if (!userCbCalled) {
+                userCbCalled = true;
+                userCb && userCb.apply(this, arguments);
+            }
+        };
         var lastPong = 0;
         bot.api.rtm.connect({}, function(err, res) {
             if (err) {
-                return cb && cb(err);
+                return cb(err);
             }
 
             if (!res) {
-                return cb && cb('Invalid response from rtm.start');
+                return cb('Invalid response from rtm.start');
             }
 
             bot.identity = res.self;
@@ -206,14 +213,16 @@ module.exports = function(botkit, config) {
 
                 botkit.startTicking();
 
-                cb && cb(null, bot, res);
+                cb(null, bot, res);
             });
 
             bot.rtm.on('error', function(err) {
                 botkit.log.error('RTM websocket error!', err);
                 if (pingTimeoutId) {
                     clearTimeout(pingTimeoutId);
                 }
+
+                cb(err);
                 botkit.trigger('rtm_close', [bot, err]);
             });
 
@@ -222,6 +231,8 @@ module.exports = function(botkit, config) {
                 if (pingTimeoutId) {
                     clearTimeout(pingTimeoutId);
                 }
+
+                cb(message);
                 botkit.trigger('rtm_close', [bot]);
 
                 /**