BLE - Glucose

Hi Guys, I’m trying to read my blood sugar through a BLE meter.

However, I cannot read the return notification. I am not getting my blood glucose value.

I was inspired by this topic:

Im using this plugin with Ionic1:

this is my code:

ble.startNotification(deviceId, '1808', '2a18', onSuccess, onError);
var data = new Uint8Array(2);
data[0] = "0x01";   
data[1] = "0x01";  
ble.write(deviceId, '1808', '2a52', data.buffer, onSuccess, onError);

Thanks in advance.