Hello experts!! I am facing a weird problem with a global variable content... I have used a button where when i press it , i send to a microcontroller a value that has been stored previously to another variable. After that the microcontroller responds with "Reg_OK" if the operation was successfull.
Doing some tests i tried different scenarios and i realized that when i tried to re-run the particular code, although the microcontroller sends "Reg_OK" then the code executes the else block. I also clear the variable before every reception but only the first time is working as expected....
P.s I also noticed that if the bluetoothClient hasn't received the 6 bytes length text, then the program freezes although i have made a test using a clock timer to abort this operation, if the microcontroller fails to respond..
Dear Panagiotis,
two things: AI2 is not behaving like an embedded system: no clock fires until the running thread is finished. This means that the clock that you tried to put to interrupt the 6 bytes reception block won't fire until the 6ht byte is received. No matter.
Second : follow the hint given by Patrick because it is the best thing that you can do to trace what is really arriving to your app.
Supposing that after the 6 bytes of the first sending ("Reg_OK") your BT sender also sends a CRLF characters pair. This will change the count of bytes. from the second message onward you will receive "CRLFReg_" (which is 6 bytes: "CR = 0x0D LF = 0x0A Reg_").
Try instead of using the Receive Byte the Receive Text using as a terminator the LF (0x0A) character.
Good luck.
Ugo.
Firstly i would like to thank you all for your answers!!! Very nice tips from all !!! i used a label as a debugger to monitor the buffer which helped a lot... i also used a clock for the bluetooth reception... and I did the following where right now it works..... (please let me know if my approach is good)
But i have one more question.... On the block below what is execution order?
I mean what happens first and what next....?? Where can i read for priorities?
A better way would be to use "serial.println (Reg_OK);" in your arduino code and in the code appinventor "receiveText.numerOfBytes = -1". Set "DelimiterByte" in bluetooth component settings to "10".
Hello can you please explain it to me in more detail?
Why to put -1 ?
And also what does the delimeterbyte setting in bluetooth component? i cannot understand the explanation of mit resources...
DelimiterByte
Returns the delimiter byte to use when passing a negative number for the numberOfBytes parameter when calling ReceiveText, ReceiveSignedBytes, or ReceiveUnsignedBytes.*
