Hi guys, I’m trying to get two Argon devices to pair via bluetooth - a “sensor” and a “clusterhead”. Currently however, the cluster head/central node crashes when it attempts to connect, showing the 10 red flashes corresponding to “assertion error.”
Here is the initial setup code for the sensor node:
const char* sensorNode1ServiceUuid("754ebf5e-ce31-4300-9fd5-a8fb4ee4a811");
const char* temperatureSensorUuid("bc7f18d9-2c43-408e-be25-62f40645987c");
BleCharacteristic temperatureSensorCharacteristic("temp",
BleCharacteristicProperty::NOTIFY, temperatureSensorUuid, sensorNode1ServiceUuid);
const char* lightSensorUuid("ea5248a4-43cc-4198-a4aa-79200a750835");
BleCharacteristic lightSensorCharacteristic("temp",
BleCharacteristicProperty::NOTIFY, lightSensorUuid, sensorNode1ServiceUuid);
const char* humiditySensorUuid("99a0d2f9-1cfa-42b3-b5ba-1b4d4341392f");
BleCharacteristic humiditySensorCharacteristic("temp",
BleCharacteristicProperty::NOTIFY, humiditySensorUuid, sensorNode1ServiceUuid);
const char* distanceSensorUuid("45be4a56-48f5-483c-8bb1-d3fee433c23c");
BleCharacteristic distanceSensorCharacteristic("temp",
BleCharacteristicProperty::NOTIFY, distanceSensorUuid, sensorNode1ServiceUuid);
void setup() {
(void)logHandler; // Does nothing, just to eliminate the unused variable warning
/* Setup bluetooth characteristics and advertise sensorNode1Service to be connected to by the clusterhead */
BLE.on();//activate BT
//add characteristics
BLE.addCharacteristic(temperatureSensorCharacteristic);
BLE.addCharacteristic(lightSensorCharacteristic);
BLE.addCharacteristic(humiditySensorCharacteristic);
BLE.addCharacteristic(distanceSensorCharacteristic);
//data to be advertised
BleAdvertisingData advData;
advData.appendServiceUUID(sensorNode1ServiceUuid);
// Continuously advertise when not connected to clusterhead
Log.info("Start advertising");
BLE.advertise(&advData);
}
Here is the code for the clusterhead:
void loop() {
Log.info("Loop entered");
//do stuff if both sensors have been connected
if (sensorNode1.connected() /*&& sensorNode2.connected()*/) {
Log.info("Connected!");
//do stuff here
}
//if we haven't connected both, then scan for them
else {
// We are not connected to our sensors, scan for them
Log.info("About to scan...");
int count = BLE.scan(scanResultCallback, NULL);
if (count > 0) {
Log.info("%d devices found", count);
}
}
}
/* function which executes while scanning on each bluetooth device which is discovered, to decide whether to conneect */
void scanResultCallback(const BleScanResult *scanResult, void *context) {
Log.info("Found a bluetooth device...");
//print info about the found bluetooth device
Log.info("MAC: %02X:%02X:%02X:%02X:%02X:%02X | RSSI: %dBm",
scanResult->address[0], scanResult->address[1], scanResult->address[2],
scanResult->address[3], scanResult->address[4], scanResult->address[5], scanResult->rssi);
// String name = scanResult->advertisingData.deviceName();
// if (name.length() > 0) {
// Log.info("deviceName: %s", name.c_str());
// }
/* Connect if it is one of our sensors */
//After connecting, this is how long to wait without connection before determining that the other side is no longer available
//Connection timeout is in units of 10 milliseconds. e.g. 1000 = 10 seconds
uint16_t timeoutInterval = 1000;
//read the serviceUUID being advertised by this device
BleUuid foundServiceUUID;
size_t svcCount = scanResult->advertisingData.serviceUUID(&foundServiceUUID, 1);
//check if it matches sensorNode1
Log.info("Found UUID: " + foundServiceUUID.toString());
Log.info("Target UUID: " + sensorNode1ServiceUuid.toString());
Log.info(scanResult->address.toString());//prints "D7:C8:38:F8:2E:06"
if (sensorNode1.connected() == false && svcCount > 0 && foundServiceUUID == sensorNode1ServiceUuid) {
Log.info("Attempting to connect to sensor node 1...");
sensorNode1 = BLE.connect(scanResult->address/*"D7:C8:38:F8:2E:06"*//*,24 ,0, timeoutInterval*/);//24 and 0 are default values
if(sensorNode1.connected()){
Log.info("Successfully connected to sensor node 1!");
//map characteristics from this service to the variables in this program, so they're handled by our "on<X>Received" functions
sensorNode1.getCharacteristicByUUID(temperatureSensorCharacteristic1, "bc7f18d9-2c43-408e-be25-62f40645987c");
sensorNode1.getCharacteristicByUUID(lightSensorCharacteristic1, "bc7f18d9-2c43-408e-be25-62f40645987c");
sensorNode1.getCharacteristicByUUID(humiditySensorCharacteristic, "bc7f18d9-2c43-408e-be25-62f40645987c");
sensorNode1.getCharacteristicByUUID(distanceSensorCharacteristic, "bc7f18d9-2c43-408e-be25-62f40645987c");
}
else{
Log.info("Failed to connect to sensor node 1.");
}
}
}
When the cluster head is started, it begins scanning and detecting bluetooth devices other than the sensor argon with no issues. It Logs all details successfully and ignores them.
Once I activate the sensor as well, it will be picked up in the scan, and the serviceUuid will be succesfully read and matched by the clusterhead. I can even get it to print out the MAC address of the sensor argon. All log statements print until the line
BLE.connect(scanResult->address)
The program will then freeze, before eventually crashing the clusterhead argon and sending the 10 red flashes.
If I instead manually replace the scanResult->address with the observed string result of scanResult->address.toString() //"D7:C8:38:F8:2E:06", then the program does not crash, but the connection fails. The Log message “Failed to connect to sensor node 1” is printed. This will repeat indefinitely.
I’m all out of ideas for what to try next. Any help is appreciated!
