bluetooth pc to phone communication and Javaio.io.IOException

update to my previous bt pc and phone post

Hi I am new to b4a and not the most experienced programmer. Over the years though I have written a few programs in VB and VBA out of desperation in my work as an offshore surveyor.
Right now I am trying to make my win7 pc and Samsung galaxy communicate serial data via blue tooth. I am also testing with transfer between the Samsung SII and an HTC Sensation. Both android devices are running 4.0.3.
I am using the new version of the tutorial and have serial lib version 1.21
When I was using Connect I could connect to the Samsung from the HTC and have text transfer in both directions but could not connect to the HTC or PC from the Samsung with the following error.
Javaio.io.IOException connection refused.
I modified the code on the Samsung for Connect3 and had to add a new integer variable for port. I don’t really know what this number is. I tried 1 and 8.
Now I can make a connection from the Samsung to the PC and from the HTC to the Samsung but still cant connect the Samsung to the HTC . The app on the HTC is still using connect.
My real question here is how can I easily test the transfer of serial data between the PC and Samsung galaxy sii. The app on the sii says it is connected to pc and the text box comes up.
I have added an incoming com port in the bt driver on the pc and it comes up as com8. I tried with a terminal program to send and receive data but I don’t think the bt connection with the phone ‘knows’ about the com port.
If I can solve this problem I have the skills to write the rest of my application but this is a bit beyond me. Can anyone help. Thx
Update: I have just tried the htc with the app using connect and I can receive serial data on com 8 in a terminal program but when I type in the terminal program the app on the htc stops.
I feel I am confused but so close!
:sign0104:

When the app stops there should be an error message in the logs. Please check it and post the message.

bt error

I went back to using just connect and the Samsung sii seems to send to the terra term program just fine. When I type in terra term though the app locks up and I think this is what you need. the phone says unfortunately bluetooth example has stopped.
Thanks for your help.

ANDYB-PC:E0:B9:A53:5C:1C
connected: true
** Activity (main) Pause, UserClosed = false **
** Activity (chatactivity) Create, isFirst = true **
** Activity (chatactivity) Resume **
java.lang.OutOfMemoryError
at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.run(AsyncStreams.java:168)
at java.lang.Thread.run(Thread.java:856)
** Activity (chatactivity) Pause, UserClosed = true **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **

Make sure that you are not initializing AsyncStreams in prefix mode. Prefix mode can only work if both sides of the connection adhere to the protocol.

working now

success! thanks i now can communicate with teraterm or a vb.net program reliably in both directions once connected. the connection process however is still a bit flaky and you seem to have to turn bt on and off and / or restart everything to get connected and to not get the ioexception error. is there anything i can do to try and make this more reliable. i will try connect2 and 3 and connectinsecure today....
Q: could you give me more information on what the RComm (i am assuming) rfcomm channel is and what UUID I should use for these methods.
Thx in advance

The default UUID is: "00001101-0000-1000-8000-00805F9B34FB"

I don't think that there is a standard default port. Did you try to use B4A-Bridge in Bluetooth mode? Does it connect properly?

bt error

yes b4a in bluetooth works great every time.
what are the rfcomm ports? what do they relate to?
thx

B4A-Bridge source code is available in the forum. It uses Serial.Listen to make the connection. The port is not explicitly set.

next step

ok thanks
just to be clear, you are suggesting I look at the source code for the b4a bridge which seems to be reliable and use to make a more secure connection?
i will investigate
i guess my question is that the connect3 uses a variable where you set the rfcom and I dont really know what that does and I cant find any documentation on it.
Thanks
ANdy

You can check B4A-Bridge code. However it is rather simple. It just uses Serial.Listen to listen for incoming connections.
Connect3 is an implementation of this workaround: Issue 5427 - android - can't initiate SPP Communication without SDP - Android - An Open Handset Alliance Project - Google Project Hosting

unfortunately bluetooth example has stopped

Oops!

wrong post

moved