Do some debugging. Break your event blocks down to one action at a time to find where the problem is. You should be able to do most, if not all with companion app, without swearing 
It's difficult to tell without the exact error message, but looking at the code "element 2" is most likely global channelA as it's the second element to the + operator and could be something other than a number. What is the value of global channelA?
(Canned Reply: ABG- Export & Upload .aia)
Export your .aia file and upload it here.
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that's what I been doing, I just dont get it, we should at least get a warning
what is the link between the companion app and my pc ????
it asks for a qr code, I scan the app qr code and it reinstalls my designed app, so what ?
going back to the web designer app, "do it" is greyed out
not the first time people tell me to click "do it" this JUST DOES NOT WORK
where is the code ?? scanning the QR just reinstalls the app
Scan or type in the six digit code
I dont have any code, where do I get one to connect to my app or whatever it is supposed to do ?
also I dont have the same screen as you, I might have installed the wrong app
why is this so cryptic ?.
Using my PC's emulator because my phone's screen recorder is a pig
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I pasted a screenshot with the full diagram
I try to produce a byte and send it via BT
TDDCCCCC
T is 0/1 type
DD is direction , 4 values 00 01 10 11
CCCCC is the channel number
What is the range of Slider1?
Can you grab for us the exact error message?
Also, for debugging, can you grab that thumbposition and drop it into a global variable, to make it available to a Do It later on?
That would help capture the Make a List value in a Do It working off persistent global variables.
the slider is -255 -> 255
apparently the slave BT device receives the proper info, but sometimes I get this
Ah, the old binary conversion fraud exposed.
AI2 binary values are text strings composed of 0s and 1s, for demo purposes.
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but I am not sure I understand these nodes
a binary 10 is indeed 2, so maybe I should not use these convert thing
but then I'll get these cannot convert to integer error
-255 to +255 is more than a byte could bear.
Try 0 to 255 and truncate it to stay within unsigned byte values.
indeed, I'll have to math abs it
but that does not explain why 2 (decimal) is going "cannot convert to integer"
YESSS !!
thank you so much guys
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