Android Question Displaying BLE Characteristics

[Bulishor]

Hi,

I'm trying to figure out which characteristic I'm looking for in my BT device. It has 17 characteristics in 6 services. I can see all the UUIDs and it seems to be smoother with 4.4 KitKat. However, I'm trying to figure out how to get the actual values. Unfortunately I don't know exactly which characteristic has the info I'm looking for so I was trying them all. I do get values (the length is greater than 0) but they come out as ASCII characters in the Log window.

The is the line I'm running:

Log("Characteristic: " & Characteristic.Uuid & " value = " & Characteristic.GetStringValue(0))

And this is what I see (for one of the characteristics):

Characteristic: 00002a23-0000-1000-8000-00805f9b34fb value = k�����"��

The only one that is displayed properly is the name of the device which is obviously a string. How can I convert that to make it readable?

 

[Erel]

The value can be a raw data (array of bytes). You cannot assume that the value is a string.

What do you mean with readable? You can get the bytes and then use ByteConverter to convert the raw bytes to a hex string.

 

[merlin2049er]

This seems to work. I'm using ble extended library. I previous set this BleCharacteristic as notify (enabled) and every 5 to 10 sec it automatically updates the stats / log file I've got setup for it.

I just needed to know if Characteristic.FORMAT_FLOAT will do the byte to float conversion for me.

Sub ble_CharacteristicChanged (Characteristic As BleCharacteristic)

   ' Dim bc As ByteConverter


      If Characteristic.Uuid ="0000fff2-0000-1000-8000-00805f9b34fb" Then
              'precent change
              'Label1.Text = Characteristic.GetStringValue(0)
            Label1.Text = Characteristic.FORMAT_FLOAT
            'Label1.Text = Characteristic.GetValue
            'Label1.Text =  bc.FloatsFromBytes(Characteristic.GetValue)
           
           
            Log(Label1.Text )
            'Test_Click
      End If
End sub