Android Question [SOLVED]Problem sending data from b4a to b4r via hc-05

[Hilton]

Hi,

I have a B4R app running on arduino mega 2560 that gets data from up to 5 lidars. There is an HC-05 bluetooth card on the mega and is used to send the data to an app on B4A. The distances from the lidars are continuously displayed on a phone/tablet using B4A and all is working fine thanks to all the information on this site.

I want to send some configuration information from the B4A to the B4R to get rid of the need of a physical dip switch on the mega board. To that end I initialised the astreams in B4A as follows

AStream.Initialize(serial.InputStream,serial.OutputStream,"astream")

On the B4R side I have

hc05ass.Initialize(hc05ss.Stream,"hc05ass_NewData","hc05ass_Error")

The data that I send from B4A to B4R is

    Dim xx As String = "name"
    Dim b() As Byte
    b = ser.ConvertObjectToBytes(xx)
    Dim ok As Boolean = AStream.Write(b)
    Log("Ok " & ok)
    Log("b written to arduino")

On the B4R receiving side i have

Sub hc05ass_NewData(buffer() As Byte)
    Log("hc05ass_newdata")
End Sub

This was just to see if anything was coming back to B4R, at this stage I just want to see if data is arriving.

Because I am a novice with this iot stuff, I was not sure whether I should expect the data to arrive at the hc-05 or serial1, so I also check s1Stream_newdata. These events do not seem to be triggered.

I have spent many hours trying and reading material on the site, but cannot find the answer.

Any help from wiser heads would be appreciated,
Hilton.

 

[Erel]

My guess is that the HC 05 is not connected properly.

Better to use prefix mode though you should see something coming anyway.

Working example: https://www.b4x.com/android/forum/threads/hc-05-classic-bluetooth.66677/#content

 

[Hilton]

My guess is that the HC 05 is not connected properly.

Better to use prefix mode though you should see something coming anyway.

Working example: https://www.b4x.com/android/forum/threads/hc-05-classic-bluetooth.66677/#content

I tried prefix mode and it reduced the complexity at the B4A receiving end, thanks. As for the hc-05 set up, i will have to get a friend of mine to double check what I have done. Prompt reply appreciated.
Hilton.

 

[Hilton]

Just in case any one has a problem sending to HC-05, my simple mistake in the B4R program was to have 2 softserials open at the same time.