Converting BLE characteristic value (length,bytes) to a String with Swift

Asked Jul 08 '21 at 20:17

Active Jul 08 '21 at 20:17

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I have a case where I actually need the raw 'bytes' data from a bluetooth characteristic converted/copied into a String. When I print the characteristic using

print("My characteristic: (String(describing: myCharacteristic))")

I get the following result

My characteristic: Optional(<CBCharacteristic: 0x28325c240, UUID = System ID, properties = 0x2, value = {length = 8, bytes = 0xfdf648dc3ae1697b}, notifying = NO>)

Specifically, I need to get 0xfdf648dc3ae1697b into a string.

I can use NSData to get the value data

let nsdataStr = NSData.init(data: (characteristic.value)!)

print("Raw: (nsdataStr)")

and I get

Raw: {length = 8, bytes = 0xfdf648dc3ae1697b}

but I am stuck when it comes to converting the whole value output into a string i.e. "{length = 8, bytes = 0xfdf648dc3ae1697b}".

asked Jul 08 '21 at 20:17

codethesolution

1

See https://stackoverflow.com/q/39075043/1187415 – Martin R Jul 08 '21 at 20:19
What do you need? Binary or Hexa string? Do you know what each byte of your data mean? – Leo Dabus Jul 08 '21 at 20:25
In this particular case, the value represented by the bytes (fdf648dc3ae1697b) is not a hexa string to decode. ultimately, I need to turn it into a string fd:f6:48:dc:3a:e1:69:7b – codethesolution Jul 08 '21 at 20:31

Converting BLE characteristic value (length,bytes) to a String with Swift

0 Answers0