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Fix exception on setNotification method call for devices that do not … #797

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Fix exception on setNotification method call for devices that do not … #797

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20 changes: 12 additions & 8 deletions android/src/main/java/com/pauldemarco/flutter_blue/FlutterBluePlugin.java
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Original file line number Diff line number Diff line change
Expand Up @@ -536,7 +536,9 @@ public void onMethodCall(MethodCall call, Result result) {
characteristic = locateCharacteristic(gattServer, request.getServiceUuid(), request.getSecondaryServiceUuid(), request.getCharacteristicUuid());
cccDescriptor = characteristic.getDescriptor(CCCD_ID);
if(cccDescriptor == null) {
throw new Exception("could not locate CCCD descriptor for characteristic: " +characteristic.getUuid().toString());
//Some devices - including the widely used Bluno do not actually set the CCCD_ID.
//thus setNotifications works perfectly (tested on Bluno) without cccDescriptor
log(LogLevel.INFO, "could not locate CCCD descriptor for characteristic: " +characteristic.getUuid().toString());
}
} catch(Exception e) {
result.error("set_notification_error", e.getMessage(), null);
Expand Down Expand Up @@ -567,14 +569,16 @@ public void onMethodCall(MethodCall call, Result result) {
return;
}

if(!cccDescriptor.setValue(value)) {
result.error("set_notification_error", "error when setting the descriptor value to: " + value, null);
return;
}
if(cccDescriptor != null) {
if(!cccDescriptor.setValue(value)) {
result.error("set_notification_error", "error when setting the descriptor value to: " + value, null);
return;
}

if(!gattServer.writeDescriptor(cccDescriptor)) {
result.error("set_notification_error", "error when writing the descriptor", null);
return;
if(!gattServer.writeDescriptor(cccDescriptor)) {
result.error("set_notification_error", "error when writing the descriptor", null);
return;
}
}

result.success(null);
Expand Down