RAK4630-R BLE multiple custom services

RUI
1

Hi,

I am able to successfully run the arduino BLE_Custom_Service example as seen below on my RAK 4630 RUI3 board.

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I added a second, custom test service -blood pressure measurement- with its own characteristic, which runs fine on its own (in isolation). Unfortunately, the moment I start both the example heart rate service and my blood pressure measurement service, the code seems to hang.

I was wondering whether there exists any tutorial or example code for running more than one service simultaneously.

2

You can have only one BLE Service and then multiple characteristics in it.

The example code does exactly this (it is just a little bit confusing in the code)

One service:

RAKBleService hrms = RAKBleService(base_uuid);

First characteristic

RAKBleCharacteristic hrmc = RAKBleCharacteristic(UUID16_CHR_HEART_RATE_MEASUREMENT);

Second characteristic

RAKBleCharacteristic bslc = RAKBleCharacteristic(UUID16_CHR_BODY_SENSOR_LOCATION);

Set properites, permissions, callbacks, … for the two characteristics:

	hrms.begin();

	hrmc.setProperties(RAK_CHR_PROPS_NOTIFY);
	hrmc.setPermission(RAK_SET_OPEN);
	hrmc.setFixedLen(2);
	hrmc.setCccdWriteCallback(cccd_callback);
	hrmc.begin();
	delay(1000);
	uint8_t hrmdata[2] = {0x39, 0x40};
	hrmc.notify(hrmdata);
	delay(1000);

	// Body Sensor Location
	//       0     = Other
	//       1     = Chest
	//       2     = Wrist
	//       3     = Finger
	//       4     = Hand
	//       5     = Ear Lobe
	//       6     = Foot
	//       7:255 = Reserved
	bslc.setProperties(RAK_CHR_PROPS_READ);
	bslc.setPermission(RAK_SET_OPEN);
	bslc.setFixedLen(1);
	bslc.setWriteCallback(send_callback);
	bslc.begin();
3

Thank you very much for the clarification !