CODEWITHSUNDEEP
iosswiftbluetooth-lowenergybytensdata
Mr. Developer
Mr. Developer

Reputation: 3417

Get value of bit from bytes | Swift 5

i need an help. So i'm getting bytes from BLE device, and i need to get a battery level. This is returned by Uint8 Bytes. So my works code (with comment): 

       func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
        print("\n------DATASTRING------\n")
        let data = characteristic.value ?? NSData() as Data

//        let stringInt = String.init(data: data, encoding: String.Encoding.utf8) ?? ""
//        let int = UInt32.init(stringInt)
//        print(int ?? 000)
        print(data as NSData)


        //        if data != nil {
//            let dataString = String(data: data!, encoding: String.Encoding.utf8)
//            print("\n------DATASTRING------\n")
//            print(dataString ?? "")
//        } else {
//            print("\n------DATASTRING EMPTY------\n")
//        }
    }

data content:

enter image description here

as you can see i have number 86 (first bit of byte), this is the batter level, but i can't read it. So how can i get this integer data 86 from byte ? I saw online some solution that you can see in the comment code, but nothing works. I need an help i'm new of swift 5. Thanks.

Upvotes: 0

Views: 1129

Answers (1)

Martin R
Martin R

Reputation: 539685

86 is the first byte (not the first bit) of the data. You get it with 

let level = data[0]

(after checking that data is not empty).

Upvotes: 1

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