make connection and login more robust

myTS3.py

@@ -48,18 +48,27 @@ class TSbot:
 
         self.pipeOut(f"Trying to connect to: {self.host}:{self.port}")
 
+        try:
             with ts3.query.TS3Connection(self.host, self.port) as self.bot:
+                try:
                     self.bot.login(client_login_name=self.user, client_login_password=self.pwd)
                     self.bot.use(sid=self.sid)
+                except ts3.query.TS3QueryError:
+                    self.pipeOut("Invalid login credentials, please check your '.toml' file.", lvl="CRITICAL")
                 try:
                     self.bot.clientupdate(client_nickname=self.nickname)
                 except ts3.query.TS3QueryError:
+                    self.pipeOut("Nickname already in use", lvl="WARNING")
                     pass
+
                 self.pipeOut(f"Successfully connected as: {self.nickname}")
 
                 # Start the Bot
                 self.loop()
 
+        except ts3.query.TS3QueryError:
+            self.pipeOut("Connection can't be established, check your '.toml' file.", lvl="CRITICAL")
+
     def loop(self):
         """
         Subscribe to event types, ping bot admins and start the event loop.
@@ -181,11 +190,15 @@ class TSbot:
         or run in silent log mode. [set reprint to False]
         """
 
-        lvln = int(getattr(util.logging, lvl.upper()))
+        lvl = lvl.upper()
+        lvln = int(getattr(util.logging, lvl))
         self.log.log(lvln, msg)
 
         if reprint:
-            print(f"[{time.strftime('%H:%M:%S')}][{lvl.upper()}] {msg}")
+            print(f"[{time.strftime('%H:%M:%S')}][{lvl}] {msg}")
+
+        if lvl == "CRITICAL" or lvl == "ERROR":
+            exit(1)
 
     def stop(self, invkr_id):
         """