Problem with frame length to sent of APP

Question

Hello,
I am developing a system where I have a app and a Rigado BMD-300 Module. I am using, for experiment, the nRF Connect App and in program, I use SDK 14.2 and s132 softdevice.
My question is that I want sending 5 bytes (40 bits) but the App only permite sending 4 bytes (32 bits).
I don't understand if my problem is in APP or in my code.
I believe that it is in APP and/or in definition of parameter GATT because I got following error when I send a frame: error 13 (0xd): GATT INVALID ATTR LEN.
I, also, thought that can to be limitation of Bluetooth but I don't no idea.
I want help for understand the error and I want meet a solution for problem.
Thanks and the best regards,
Daniel Fernandes

bjorn-spockeli · Accepted Answer

Exactly what I wanted. In your code you'll see that the length of the characteristic value is set to 4, i.e. 4 bytes. 
 attr_char_value.max_len = 4; attr_char_value.init_len = 4; 
 If you change this to 
 attr_char_value.max_len = 5; attr_char_value.init_len = 5; 
 Then you should be able to write 5bytes to the characteristic. 
 Best regards 
 Bjørn