\r is not working. What is the equivalent in app inventor?

[Mburu Mbugua]

I want to use carriage return to split text received from a Bluetooth device. I have tried \r and it is not working.  \n is recognized.  Kindly assist.

[Ghica]

Try \n

Cheers, Ghica.

[Abraham Getzler]

\n is Line Feed (LF), which is easy to send from Arduino using println().

If you have no control over the transmitter, and must split at CR carriage return,

you can specify a delimiter of the decimal equivalent of CR = 13 in the Bluetooth client Designer component.

If you do that, and if you request -1 as your number of bytes in a ReadText, you will get just one message at a time,

with CR as the message delimiter.

ABG

[Mburu Mbugua]

Thank you very much Abraham. Specifying the delimiter in the Bluetooth client partially solved the problem.  If I want to split using the CR how can I do it?  I am asking this because some of the devices are sending the data in the format  STRING1crSTRING2cr (cr=carriage return).  If I use the delimeter I wll not pick STRING2 which is the one I need. Kindly assist further. I have tried splitting using \r but it is not working.

[Abraham Getzler]

Are you required to receive the strings two at a time, like temperature and humidity, or are the two strings

just the same reading in two messages?

If the message really is only one string at a time, twice, then request -1 bytes to get only one string at a time.

According to the ascii table CR is hex 0D.

See attached for hexify, a block that will create an Ai2 text value of CR :

It uses one of the Web component blocks for the conversion

(no web access needed.)

Split at (incoming_text, hexify("0D"))  will split incoming message into a list of strings at each \r.

Use SELECT ITEM n from LIST to get each part afterwards until length of list.

Show us your blocks and BTClient Designer settings if this does not work for you,

along with right-click-DoIt values of the incoming data stream.

ABG