Comm port refusing my requests

[tote_b5]

Hi all,

I'd like to transfer data over CSD and for that I open a comms channel with RComm. First question: why does RComm::Open not work with ECommExclusive only with ECommShared? It always returns -21 (KErrAccessDenied) when call this method with this parameter.

Anyway, I try to set the buffer size with RComm::SetReceiveBufferLength to a value and when I immediately query the new buffer length it's always 8192 regardless of what I specified previously. Even more, when I do NOT set it to anything (i.e. do not call this function) it remains 8192 regardless of what is written in SDK help: generous default is 1024. Any idea why I am not allowed to change this value?

It's as if there was another owner of the comm port in question (hence the failure for opening it in exclusive mode) that does not allow me to do anything (like setting the buffer size). This is also suggested by the name of the function with which I open the comm port: LoanDataPort. Any comments on this, can anyone confirm it?

Or any other idea?

Thanks,

Tote

[fogo99]

Do you run your application when the phone is still connected over USB? I had similar comm port issues. When I disconnected USB it disappeared.

[tote_b5]

Do you run your application when the phone is still connected over USB? I had similar comm port issues. When I disconnected USB it disappeared.

No, the phone is not connected to any external devices via USB.

[fogo99]

My issue was related to data comm ports. There are several ports available on my phone (except when USB connected, as described).

I see, this is a CSD specific issue. I never used CSD. Can't help further...

[tote_b5]

Maybe for CSD are also several ports available? Or do you use DATAPORT::XY as well for CSD? (I never used CSD).

What is this DATAPORT::XY? I didn't get the question, sorry.

The point is that I establish a data connection over CSD and I do NOT explicitly specify any port numbers. I establish a call with RCall and I inherit a comm port configuration (from RCall) that I use during RComm configuration.

[fogo99]

Sorry, my mistake. I thought for CSD you also have to specify a port number. But as you described in your last post, this is not needed.