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Expand data sent via notification

Andrew Linton
Prodigy 30 points

I am using the simpleBLEperipheral sample code and trying to periodically take some readings from ADCs and an accelerometer then send the 13 Bytes of via the Characteristic4 notification.

When I try to send anything larger than a byte, nothing shows up in LightBlue when listening for notifications. How can I expand the characteristic to accept and send 13 (or more) bytes?

  • 0
    TI__Mastermind 34660 points

    Hello.  The length of each characteristic is defined in the profile. For example, in the simpleBLEPerpiheral project, in the simpleGattProfile(.c), most characteristics are configured to one byte. Characteristic 5 is configured to five byte however:

    // Characteristic 5 Value
    static uint8 simpleProfileChar5[SIMPLEPROFILE_CHAR5_LEN] = { 0, 0, 0, 0, 0 };

    Using this as a base, you can modify this or add a similar characteristic which is 13 byte.

  • 0 in reply to Tim C
    Prodigy 30 points

    Thank you for the quick response, but does anyone have an example of doing this? I'm trying to add a characteristic similar to that of Char5, but even though it all compiles I cant get the characteristic to show up on any sniffing applications. 

    Thanks again,

    Andrew

  • 0 in reply to Andrew Linton
    Expert 2500 points

    Hi Andrew,

    You just need to change length of macro and according modification in code.

    Can you share code that you have modified  if possible? It'll be helpful.

    Thanks.