Using UUIDs and Bluetooth

I did some more steps towards accessing Kenwood TH-D74’s services via bluetooth. I struggled for some time understanding how discovery based on UUIDs work. I was not aware that, for each service profile, there is a standard Universally Unique Identifier (UUID) documented in Bluetooth SIG specs. Specifically for Serial Port Profile (SPP) service, the UUID is 0x1101. More information here. So my code is now:

– (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

thuuid = @[@"0x1108"]; // SPP



– (void)startScan {
[manager scanForPeripheralsWithServices:thuuid options:nil];


– (void)centralManagerDidUpdateState:(nonnull CBCentralManager *)central {
switch (central.state) {

case CBManagerStatePoweredOn:
_textField.stringValue = @"Central state is powered on\n";
[self startScan];

Building and run, gives me this:

Bingo ! More to come.


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