Android Question BT bytes send and get response

[vincentehsu]

Dear Sir:
I used the sample code from https://www.b4x.com/android/forum/threads/new-serial-library-bluetooth-communication.6910/
but i don't how to get response from bt device

 

[Erel]

You should use AsyncStreams:
AsyncStreams Tutorial
[URL='https://www.b4x.com/android/forum/threads/14768/#content']Android Bluetooth / BluetoothAdmin Tutorial [/URL]

 

[vincentehsu]

so,I can get the bt device response data in below section?

Sub AStream_NewData (Buffer() As Byte)
    'LogMessage("You", BytesToString(Buffer, 0, Buffer.Length, "UTF8"))
   
    txtLog.Text =BytesToString(Buffer, 0, Buffer.Length, "UTF8")
End Sub

 

[vincentehsu]

Dear Sir:

I can't get any response from my BT device via

Sub AStream_NewData (Buffer() As Byte)
   
Dim i As Int
    For i= 0 To Buffer.Length-1
        Log(Buffer(i))
    Next
End Sub

 

[raphael75]

Does the BT device receive bytes from your Android device when you use the Write command in your B4A app?

 

[vincentehsu]

Yes,the same command used in IOS is work,but it's not in B4i

 

[raphael75]

I'm not sure if there is a misunderstanding. Do you use B4A or B4i?

 

[vincentehsu]

I have an Xcode project.i wanna write an android version via b4a.I used the same command in my Xcode project and it's worked fine

 

[vincentehsu]

It's maybe still not so clear,let me upload my source code and explain that.
I have an Xcode project.i wanna write an android version via b4a.I used the same command as below in my Xcode project and it's worked fine

(void)getDeviceSN{
    NSLog(@"getSN");
    self.status=MPAGetSN;
    Byte cmd0[0x04] = {0x00,0x02,0xF2, 0xF2};
    [self send:cmd0 andLength: sizeof(cmd0)];
}

in my b4a project ,I used the same command but i can't get any response from bt device

Sub btnSend_Click
    Dim TriggerPayment() As Byte = Array As Byte(0x00,0x02,0xf2, 0xf2)
    AStream.Write(TriggerPayment)
End Sub

attachment is my b4a project，could anybody tell me what event can i get the response from bt device

 

[Erel]

Go over AsyncStreams tutorial: AsyncStreams Tutorial

You should not use prefix mode in this case.