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I want to call a number if the Bluetooth receives "C" and send SMS if the Bluetooth receives "S". I tried to use these blocks but the app does the first if statement only and does not see the other one. So, in this example it only sends SMS, but if I moved the call blocks up and but the send below it will just call a number without sending SMS.

I don't know how does it read the Arduino serial monitor but its like this:

C
S
"other data"

I hope someone helps as I need it for a competition in two days

Another thing is that I only want the Bluetooth to receive the letter once but it keeps ringing or sending SMS until the serial stop sending the letters.

Each time you receive text from BlueTooth without saving it in a variable, you are throwing away the previously received text. The solution to this is to receive text into a variable once, and test the variable with all your different tests.

Please see the Delimiter article in FAQ

Be sure to use println() at the end of each message to send from the sending device, to signal end of message. Do not rely on timing for this, which is unreliable.

In the AI2 Designer, set the Delimiter attribute of the BlueTooth Client component to 10 to recognize the End of Line character.

Also, return data is not immediately available after sending a request,
you have to start a Clock Timer repeating and watch for its arrival in the Clock Timer event. The repeat rate of the Clock Timer should be faster than the transmission rate in the sending device, to not flood the AI2 buffers.

In your Clock Timer, you should check

  Is the BlueTooth Client still Connected?
  Is Bytes Available > 0?
     IF Bytes Available > 0 THEN
       set message var  to BT.ReceiveText(-1) 

This takes advantage of a special case in the ReceiveText block:

ReceiveText(numberOfBytes)
Receive text from the connected Bluetooth device. If numberOfBytes is less than 0, read until a delimiter byte value is received.

If you are sending multiple data values per message separated by | or comma, have your message split into a local or global variable for inspection before trying to select list items from it. Test if (length of list(split list result) >= expected list length) before doing any select list item operations, to avoid taking a long walk on a short pier. This bulletproofing is necessary in case your sending device sneaks in some commentary messages with the data values.