BLE and serviceUUID and charactersiticUUID


#1

HI , i’m using ionic to connect Nordicsemi device with BLE pluging, i cant get the list of devices and can connect but for reading and writing the api have this signature in BLE plugin

read(deviceId, serviceUUID, characteristicUUID)

and i don’t now what is serviceUUID and characteristicUUID for reading and writing


#2

Hi,

A BLE device has different services (identified by UUID like 0x180a) and each services has multiple characteristics (identified by UUID like 0x2A24).
For example the service Device Information 0x180A has a characteristic Name Facturer 0x2A29, another characteristic Model Number 0x2A24 etc…

So, if you want to retrieve the Name facturer information, you have to use :

ble.read(deviceId,'180A','2A29').then(function(buffer){
    alert(String.fromCharCode.apply(null,new Uint8Array(buffer)))
});

You will find more information here : https://www.bluetooth.com/specifications/gatt/services clic on services to get the detail