SLIP, UIP and RFM12B « Jee Labs Talk

SLIP, UIP and RFM12B

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gwenhastings

Hi Jean,

      have you given any thought to SLIP/IP over the rfm12B??? the uip implementation here Page> and slip/arduino implementation here  are quite interesting, The Helloworld server was dead easy to get working(but has some errors) and it takes up 9k(slip) but it can go peer to peer etc.

       gwen


				Posted 10/07/2010 03:55:08


	
		
			
								
					jcw

				
			
			
				
Interesting. I've seen the uip site, but not the one on the playground. That would be a fun project to try out!
Full SLIP/CSLIP over RFM12B wireless is a lot more work, though. You need to create a virtual serial connection, and you need to think about how this would work with multiple nodes (SLIP is a point-to-point mechanism, i.e. 1:1, not N:M).



				Posted 10/07/2010 19:49:40
			
		
	
	
		
			
								
					epokh

				
			
			
				
Yes the SerialIP leaves few memory space for doing something interesting. I was using it to send some simple sensor reading to pachube.
There's also the USBIP project which is very nice, so you can use it to connect 2 networks of jeenodes over ip. quite nice.



				Posted 11/07/2010 08:13:42
			
		
	
	
		
			
								
					gwenhastings

				
			
			
				
hmm, problem is is that slip doesnt do routing just point to point that is not a problem if all slip implementations are near a host that does do routing.
If however we want to do something fancier on the DLC layer say like transport packets from more distant RFM12Bs(mesh networking) we start to run into code size issues if we actually wanted to run apps along side our networking code.
ie I am currently trying to shoehorn bill roys bitlash into the same 328P/644P  as slip(the reasons are obvious to me may not be to you). AND its starting to look like a 328P mated for just radio/slip duties to a RFM-12/22 would be the way around this, putting everything in the xbee price range, which does have mesh networking and the arduino compatible FIO/328v  platform to run it on and represents a significant stepup in pricing per node.
EPOKH: VERY interesting on the USB/IP looking very closely at it for other purposes.



				Posted 14/07/2010 18:53:00
			
		
	
	
		
			
								
					epokh

				
			
			
				
Wow if you manage to squeeze the code for the 328P that will be great. Yes the xbee and FIO solution will cost more.
One of my side project is to embed a nordic nrf24l01  into a mini arduino pro.
It hasn't any mesh opportunities but is a cool chip in terms of speed up to 2 Mbps and the hardware shockburst mode. As you can see I managed to produce a tiny pcb with the SPI interface. I'm coding some arduino libraries for a simple point to point transmission.
For meshed networks another solution will be to use a RFD21733 which has a lower price compared to an xbee.
I wanted to try that as well but my time is limited!



				Posted 16/07/2010 12:34:30