You must use port 5500 instead of 54098. You got error about unknown host because keypebble understand only IP address or hostname without port.

Of course, you are right, but this may lead to some problems some times - "less freedom, more problems". Fortunatelly, there isn't reason to make SDIOWorx closed-source project. As far as I understand (from their documentation) only SDIO-WiFi client driver will be closed-source. I hope that SDIOWorx will successfully implement to Linux devices SDIO technology. Now, we must simply wait... Within next few months we will hopefully get SDIO support under Linux.

Don't know, but SDIOWorx must be an open-source project in order to support 2.4 and
2.6 kernels. As far as I understand, main idea of SDIOWorx project is that
SDIOWorx itself is open-source, and it allows throw its API make use of binary
drivers for SDIO. Accordingly to their documentation, SDIO-Blutooth and
SD-UART "client" drivers will be open-source, and SDIO-WiFi will be
closed-source (because SDIOWorx allows using of such driver on all kernels, this
isn't big disadvantage). This is everything I know, so if you have additional
questions, ask them personally by e-mail: <info@embwise.com>.

SDIOWorx will be very useless if it will not support custom kernels. Fortunatelly, according to their specifications, SDIOWorx will work with all 2.4 and 2.6 kernels. That means that SDIOWorx will work with any modern kernel.

Here is current situation with SDIO support.

I talk with owner of Zaurus SL-C860, and he said:

============
I do have older Zaurus SL-C860. The WiFi SD card from
http://www.c-guys.net/ works only with C860 and C760 original japanese
roms, not with SL-C3100. The problem is that they never updated their
drivers.
============

Also, I did wrote to EmbWise about their SDIOWorx technology, and they said:

============
We have a working SDIO-WiFi drivers on the platforms that we support our SDIOWorx with.We have ported our SDIOWorx onto ONLY Zaurus SL-C3000 and not all of Zaurus PDAs.However we would think that the stack and the driver would work on Zaurus SL-C1000 as well as SL-C3100,since they have the same hardware architecture.But we don't want to commit till we decide to and test the software on these other models.

The WiFi driver is being tested now on SL-C3000.
============

I suppose that C-Guys will not support new Zaurus' in the future, but coming soon SDIOWorx will hopefully solve problem with SDIO for all Linux-based PDAs which can support it, including new Zaurus SL-C3100.