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There is no standardised API for accessing the serial port in a JavaTV or MHP STB. The main purpose of this is to provide debugging output (and possible application download on some developer systems). Usually the port itself will be a standard RS232 port.
Individual STBs may provide an interface to it, but this will depend on the hardware manufacturer and middleware vendor, and so there is no interoperable solution.
There is requirement that an MHP box support an RS232 port, hence there are no standard API's to support it. All the Debug boxes I've seen use a serial port for debug (uploading xlets to debug are reading back trace messages written to standard out).
If you want to use the return channel you'll need to look at the org.dvb.net.rc packages to set up the return channel. For example use:
to find out what return channel hardware you've got attached to your STB. After you've set up the connection you can use the standard java.io and java.net packages to talk to your remote server.
Hope this helps,
I reviewed org.dvb.net.rc packages to set up the return channel.
1. I will be using Modem and UART in STB to communicate with the server.
2. I am not JAVA person. I know Microsoft Visual Studio .NET 2003. I want to
simple program using org.dvb.net.rc packages to set up the return channel.
Can I do with Microsoft Visual Studio .NET 2003? If Yes, which project
I should select?
I need to setup demo for the retutn channel, using org.dvb.net.rc packages,
uart and modem.
Thanks for your help.