Netty and a character device file?

[Rogan Dawes]

Hi folks,

I'm thinking of using netty to multiplex traffic from network sockets over a character device, like a serial port. Does netty support file access in this way?

Regards

Rogan

[Norman Maurer]

Not sure what exactly you are asking about but netty supports serial ports:

https://github.com/netty/netty/blob/4.1/transport-rxtx/src/main/java/io/netty/channel/rxtx/package-info.java

Bye,

Norman

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[Rogan Dawes]

Hi Norman,

So, I'm not really using a serial port, but rather a HID Gadget. I used the serial port as an example that may be more familiar to folks, but I can see I may have confused issues more than helped.

My HID Gadget reads and writes 64-byte reports to the USB host on the other end of the cable, and it is this that I am trying to accomplish using Netty.

Looking at the RXTX implementation, it seems like I need to implement a new FileChannel or similar, that can read a file, and fire appropriate events when the read succeeds, and similarly for writes.

Thanks for the pointer!

Rogan

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[Rogan Dawes]

Ok, so I implemented a FileChannel based on OioByteChannel, and it seems to work reasonably well.

My only problem is that I am required to read and write in chunks of 64 bytes from the device, and I cannot see how to influence the size of the ByteBuf used when reading or writing, passed to OioByteChannel.doReadBytes(ByteBuf) and OioByteChannel.doWriteBytes(ByteBuf).

Any more hints?

Thanks!

Rogan