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serial chat communications using cradle

Posted on 2004-10-05
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Last Modified: 2013-12-27
Hi,

I have a Tungsten C that has a USB cradle port.
I am about to make an application that communicate with the desktop via the USB cradle port. I know that I can use all these functions to connect to serial port:
SrmOpen(logical_port, baud_rate, &port)
SrmSend(port, buffer, number_of_bytes, &error_code)
SrmReceive(port, buffer, number_of_bytes, timeout_ticks, &error_code)
SrmSendFlush(port)
SrmReceiveFlush(port, timeout)
SrmClose(port)

But, how does the desktop get the information? Is the desktop supposed to open a server to receive the data when the palm PDA use SrmSend function? If it is, what port number does the desktop has to listen a connection?

I seen a tutorial: http://mobile.eric-poncet.com/palm/tutorial/serial.html
But, I can't get it to work. Why does the server has to be run at port#6416 ? Is port number 6416 only for POSE? What about for the real USB cradle port for Tungsten C? Will it connect to the same port number?

Thanks,
Widy
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Question by:widyanto
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by:vadim_ti
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i think to make desktop server side for usb is quite difficult,
more simple solutiion is to make a conduit and to work via hotsync
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by:widyanto
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Yeah, I looked at some way to communicate using USB, and it's quite difficult.
Do you know where I can get a tutorial for simple conduit? or what book that has a simple tutorial for conduit?

Thanks,
Widy
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by:vadim_ti
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you can download CDK (conduit development kit) from PalmSource
it is well documented and there are examples

http://www.palmos.com/dev/dl/dl_sdks/dl_cdk/
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by:widyanto
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I can't find the examples, can you give me links.

Thanks
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by:vadim_ti
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after you install cdk you have  examples
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by:msjammu
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widyanto,

When you hotsync to Palm OS emulator,  using virtual phone,  you must bind to a port number. All hoitsync calls are then redirected to that port number. 6416 in the default port.
-------------------------------------------
Virtual Phone works best if you select TCP/IP. Selecting TCP/IP redirects all data transfers intended for the serial port to a TCP/IP socket and does not require the use of a null modem cable.

The IP address: entry field default is localhost:6416. This option is available when Serial Port is set to TCP/IP. You can indicate host and port number that the Palm OS Emulator is to connect to. Virtual Phone must use the same settings

:)
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by:widyanto
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The examples in the CDK is not really clear. Is there any other example that has a step by step?

What is "virtual phone" ?
Is it only POSE can use a port number? or a real Palm device can hotsync using port number?

Thanks,
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msjammu earned 500 total points
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widyanto:

If you are new to Conduit development I suggest you not to use any wizards to create code for you. Write whole conduit manually yourself (using VC++ in your case).

When I started with it i faced similar problems like you have,
Here is a book that had one simple conduit example that I learned from

Palm Programming: The Developer's Guide
By Neil Rhodes, Julie McKeehan
http://www.oreilly.com/catalog/palmprog/toc.html

I also suggest you to Join the Conduit Developer Forum
The Conduit Developer Forum is a great place for conduit information. You can know here the problems others are facing and the solutions they got for them
http://www.palmos.com/dev/tech/conduits/

Also see the Conduit Development Knowledge base at
http://kb.palmsource.com/cgi-bin/palmsource.cfg/php/enduser/std_alp.php?p_lva=&p_li=&p_page=1&p_prod_lvl1=%7Eany%7E&p_cat_lvl1=6

Also see these usefull resources

http://uk.builder.com/whitepapers/0,39026692,60088979p-39000971q,00.htm
http://itpapers.zdnet.com/abstract.aspx?docid=88980&promo=50001
http://uk.builder.com/whitepapers/0,39026692,60088980p-39000971q,00.htm

Hope this help

Regards
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