Serial library and Android 4

[dsirio75]

Hi all, i have a problem with the serial library on an android 4 device (Galaxy Tab).

My app connects perfectly an OBD device with my motorola atrix (2.3.4) but when i try my app on Galaxy Tab (ICS) it won't connect.

Return me java exceptions saying "Invalid Exchange" and asks me to pair device again (i already did it).

Some idea? Tried Connect3 and ConnectInsecure with port 1 but didn't work...

Here's my code for the connection

Sub Admin_DiscoveryFinished
   ProgressDialogHide
   If foundDevices.Size = 0 Then
      ...
   Else
      Dim l As List
      l.Initialize
      For i = 0 To foundDevices.Size - 1
         Dim nm As NameAndMac
         nm = foundDevices.Get(i)
         l.Add(nm.Name)
      Next
      Dim res As Int
      res = InputList(l, "Select", -1)
      If res <> DialogResponse.CANCEL Then
         connectedDevice = foundDevices.Get(res)
         serial1.Connect(connectedDevice.Mac)
      End If
   End If
End Sub

Thanks

 

[Erel]

Can you post the exact error message from the logs?

I do not think that it is related to Android 4.0.
You can try to use B4A-Bridge over Bluetooth and see whether it works with your device.

 

[dsirio75]

Today i will connect my Tab with the car and a laptop with B4A to view exact log.

By the way when i try to connect Tab to Phone with Bluetooth example i get this...

:78:CA:04:C4:F8:97
:A0:75:91:E7:C0:10
DanAtrix:3C:43:8E:32:43:70
LG GW300:5C:17:D3:0C:2F:A5
E2550:3C:5A:37:B4:DF:A7
Giuliana:78:CA:04:C4:F8:97
:00:1C:43:C1:D2:71
Iva:00:1C:43:C1:D2:71
connected: false
java.io.IOException: Unable to start Service Discovery

When i connect phone to tab instead all works

 

[dsirio75]

Is There difference between WiFI Mac address and Bluetooth Mac? As i can see i discover my phone with a Mac which ends with 2 chars different from real Mac (i read it in wifi advanced settings)...

 

[thedesolatesoul]

Each network interface has a different MAC.

 

[dsirio75]

Ok, so my problem is in Serial1.Connect. I get "Unable to start Service Discovery" with .Connect and "Connection refused" with .Connect3 ...

Some Idea?
If is not related to Android 4 can be related to Galaxy Tab? And why?

 

[Erel]

I have a Galaxy Tab here running Android 3.1 and Bluetooth connects fine. I guess that you tried to unpair and pair that devices and to reboot both devices?

 

[dsirio75]

I already did that...
It asks always to pair devices ... but they are already paired...

I tried to install CM9 (Android4) to my Atrix and it works too... Don't know what to do now...

 

[dsirio75]

I have a doubt:
My Tab 2 has bluetooth 3
Atrix has 2

Maybe a bluetooth 2 can't receive connections from 3 with Serial library?

 

[Erel]

Serial library is a (thin) wrapper above the standard Bluetooth APIs. Android Bluetooth support is not perfect. It might be a specific issue with this ROM version.

 

[dsirio75]

So Galaxy Tab 2 can't use Serial library to connect other bluetooth devices (OBDII in this case) ...
This is a problem for me because other apps can connect to that device from Tab ...

Thank you Erel for your support for now.

 

[dsirio75]

After many searches i found an interesting thing on last torque update change log: it says "Workaround for Galaxy Tab 2 OS bug". I Suppose there's some Samsung personalization that is causing problems...

Since torque programmers found a solution, do you think is possible to understand what to do to fix it here too?

Thanks...

 

[Erel]

Try searching for the required fix. I currently don't have access to this device.

 

[Penko]

You may also ask Ian Hawkins, the author of Torque. He is always very responsive. Or just write him as a user and ask him why you have to tick this checkbox and what is it related to.

Sent from my HTC Desire using Tapatalk

 

[dsirio75]

Ok, i finally found my personal solution and it seems to work fine.
What i do? I call serial1.Connect(connectedDevice.Mac) the first time, on every connection error i call serial1.Connect3(connectedDevice.Mac, port) with port alwys incremented ... It fails 6/7 connections for example but connects 8th...

Sub Admin_DiscoveryFinished
   ProgressDialogHide
   If foundDevices.Size = 0 Then
      ' some code
   Else
      Dim l As List
      l.Initialize
      For i = 0 To foundDevices.Size - 1
         Dim nm As NameAndMac
         nm = foundDevices.Get(i)
         l.Add(nm.Name)
      Next
      Dim res As Int
      res = InputList(l, "Seleziona il dispositivo da connettere", -1)
      If res <> DialogResponse.CANCEL Then
         connectedDevice = foundDevices.Get(res)
         Try
            serial1.Connect(connectedDevice.Mac)
         Catch
            Log(LastException)
         End Try
      End If
   End If
End Sub

Sub Serial1_Connected (Success As Boolean)
   ProgressDialogHide
   Log("connected: " & Success)
   If Success = False Then
      Log(LastException.Message)
      If port < 100 Then
         port = port + 1
         serial1.Connect3(connectedDevice.Mac, port)
      End If
   Else
      ' do something (connected)
   End If
End Sub

I hope this will help someone ;-)

 

[Erel]

Thank you for sharing your solution.

 

[priusfan]

@desirio75
thank you for your workaround for BT and galaxy tab 7.

I made a small dev using BT with STN1110 for electric cars mitsubishi iMiev & peugeot iOn.
it was working well with any android device but galaxy tab 7. now it is ok.
thanks again.

 

[GaNdAlF89]

I have Samsung Galaxy Tab 2 with Android 4.0.3, I tried the desirio75 solution but it doesn't work. How can I resolve?

 

[Erel]

Which error do you get with the regular Connect method?

 

[GaNdAlF89]

Which error do you get with the regular Connect method?

A Java exception with "Invalid Exchange" message.