Hi there!
After a few weeks break, I resume my project (Control box for Focus Staking photo).
In my program I use a bluethoot module for MIT -> Ardunio communication.
At the Bluetooth client, I use UTF-8 character encoding and a 10-byte separator.
In my program I used "Call Client_Blutooth1 Receive text number of bytes -1.
For now it works.
But I admit that I don't understand how it works...
Do you have any tutorials that explain (I'm not an expert) how it works?
Who would talk about Byte separator, ACSii, why number of bytes-1, what is it, why use this method, when, how,...?
I searched, but I couldn't find...
Thanks in advance! 
(I use Google translate, don't hesitate to ask me for more info if I haven't been very clear)