"when texting1.MessageReceived" does not show the hole message

I really hope to get some help from you!

My situation is following:  I am building an app to controll a GPS alarm unit that controls by texting.

Everything works good except when i get a text response from the device containing a link to googlemaps.

The "get messageText" then only contains the last six coordinates...

So, how can i get the app to show me the whole link??

is this a very large message the device sends? 

the maximum number of characters is 153, see also here https://code.google.com/p/app-inventor-for-android/issues/detail?id=234

if there are more than 153 characters in the message, the first 153 characters are lost, only the end of the text will be shown