paulvha
commented
1 year ago As have spent a lot of time on the ArduinoBLE code in a number of projects, I decided to take a look. I could reproduce ' freeze', and maybe it is the same. There are multiple issues to consider.
Make sure you use the latest V1.3.2. Especially because of the issues https://github.com/arduino-libraries/ArduinoBLE/issues/281 and https://github.com/arduino-libraries/ArduinoBLE/pull/264. This is especially important is there are multiple BLE peripheral devices available.
In your code you VERY often trigger the BLE.scanForUuid() unnecessarily. It could cause the HCI layer to go out of sync or "bananas'. Seems that was one of the reasons for the freeze or the timing of it on my Sparkfun Apollo3 / ATP board. A new scan will cause the to first stop scanning, set the scan parameters and start scanning again. Not necessary and can be handled with the changes in the code below. A scan request does not timeout.
I changed the code so I could run a test against a peripheral. During my tests the peripheral shutdown while it was trying to perform the first steps of explorePeripheral(). Hence I reset the 'DoScan' after each call to explorePeripheral(). No matter whether it returned true or false. That return value is not used anyway.
The peripheral.disconnect() at the end of explorePeripheral() is unnecessarily(), assuming that this was triggered from the peripheral already. It is not able to cause a disconnect as it is disconnected already. It was not a reason for freeze.. just not necessary.
After the code changes it kept running for 3 hours.. no problems... it would fail after15 minutes before..
Maybe it helps a bit.
regards Paul
#include <ArduinoBLE.h>
char* PERIPHERAL_LOCAL_NAME = "SOME PERIPHERAL NAME";
#define BLE_UUID_SENSOR_DATA_SERVICE "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
#define BLE_UUID_MULTI_SENSOR_DATA "yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy"
#define BAUDRATE 115200
#define UPDATE_INTERVALL 10
#define BLE_POLL_INTERVALL 5
uint64_t previousMillis = 0;
bool DoScan = true; // ADDED
void setup() {
Serial.begin(BAUDRATE);
delay(2000);
previousMillis = millis();
BLE.begin();
// BLE.scanForUuid(BLE_UUID_SENSOR_DATA_SERVICE); // REMOVE
}
void loop() {
unsigned long currentMillis = millis();
if (currentMillis - previousMillis > UPDATE_INTERVALL) {
previousMillis = currentMillis;
if (DoScan) { // CHANGED DO NOT HAMMER HCI LAYER
BLE.scanForUuid(BLE_UUID_SENSOR_DATA_SERVICE);
DoScan = false;
}
BLEDevice peripheral = BLE.available();
if (peripheral) {
if (peripheral.localName() != PERIPHERAL_LOCAL_NAME) {
return;
}
BLE.stopScan();
explorePeripheral(peripheral);
DoScan = true; // ADDED
}
}
}
bool explorePeripheral(BLEDevice peripheral) {
if (!peripheral.connect()) {
return false;
}
if (!peripheral.discoverAttributes()) {
peripheral.disconnect();
return false;
}
BLECharacteristic multiSensorDataCharacteristic = peripheral.characteristic(BLE_UUID_MULTI_SENSOR_DATA);
if (!multiSensorDataCharacteristic) {
peripheral.disconnect();
return false;
}
if (!multiSensorDataCharacteristic.canSubscribe()) {
peripheral.disconnect();
return false;
}
if (!multiSensorDataCharacteristic.subscribe()) {
peripheral.disconnect();
return false;
}
while (peripheral.connected()) {
unsigned long currentMillis = millis();
if (currentMillis - previousMillis > BLE_POLL_INTERVALL) {
previousMillis = currentMillis;
BLE.poll();
if (multiSensorDataCharacteristic.valueUpdated()) {
multiSensorDataCharacteristic.readValue(...);
}
// if (peripheral.rssi() != 0) {
// digitalWrite(RSSI_OK_LED_PIN, HIGH);
// } else {
// digitalWrite(RSSI_OK_LED_PIN, LOW); // red alarm LED ON
// }
}
}
//peripheral.disconnect(); // ASSUME YOUR DISCONNECT IS TRIGGERED FROM REMOTE
return true;
}```
iKK001
I am using the Xiao BLE nRF52840 from Seed Studio since the size is what I need (i.e. Nano 33 is too large)
However, using BLE Receiver Central, it freezes after 15-30min !!!
The sender is off most of the time and will only connect and send sensor data about once or twice a day. I try to have the receiver active 24h. But it freezes after 15-30min.
Here is my receiver Central code:
I tried to add a periodic BLE.end(); followed by a BLE.begin(); every 10 seconds because I believed this might help. But no change.
It seems that only a module RESET will solve the problem.
However, in my application I would like to have the receiver listen during 24 hours (and never power it off or reset).
What could be the issue of the freeze ?