Nrthugu

So for a project I have trying to have 2 way communication between an Adafruit Feather 32u4 and a Raspberry PI 3 via Bluetooth Low energy. I was able to get the communication to work via the UART service but I would like to create a custom service with some characteristics that can be set and read from both devices. I am running Node with noble on the raspberry pi and that is how I plan to set and read the values coming from the Feather.

Does anyone have any code examples for me to get this working? I seem to have trouble finding much information regarding custom services via the BLE standard.

Here is how I am creating my service:

  Serial.println(F("Adding the definition (UUID = 0x8000): "));

  success = ble.sendCommandWithIntReply( F("AT+GATTADDSERVICE=UUID=0x8000"), &serviceId);

  if (! success) {

    error(F("Could not add service"));

  }



  Serial.println(F("Adding the status characteristic (UUID = 0x8001): "));

  success = ble.sendCommandWithIntReply( F("AT+GATTADDCHAR=UUID=0x8001, PROPERTIES=0x08, MIN_LEN=2, DATATYPE=INTEGER, VALUE=0, DESCRIPTION=Outlet 1 Status"), &StatusCharId);

    if (! success) {

    error(F("Could not add characteristic"));

  }

And this is how I am trying to read / write with noble (node)

device.discoverServices(['8000'], function(error, services) {

                if(error) {console.log(error);}

                var customService = services[0];

                console.log(customService);



                if(customService) {         

                    customService.discoverCharacteristics(null, function(error, chars) {

                        for(var i in chars) {

                            console.log(' ' + i + ' uuid: ' + chars[i].uuid);



                            if(chars[i].uuid == '8001'){

                                    setInterval(() => {

                                        const convert = (from, to) => str => Buffer.from(str, from).toString(to)

                                        const utf8ToHex = convert('utf8', 'hex')

                                        const hexToUtf8 = convert('hex', 'utf8')

                                        var random = getRandomInt(2);



                                        chars[i].write(new Buffer(random), true, function (error) {

                                            if (error) {

                                            console.log(error);

                                            }

                                        }.bind(this));

                                        chars[i].read(function(error, data) {

                                            // data is a buffer





                                            var val = data.toString('hex');



                                            console.log(data.toString('hex'));

                                        });

                                    }, 2500);               



                            }

It doesn't seem that my node code is properly setting the value. And I am looking to then listen for change on the Feather