[EMAIL PROTECTED] wrote: > Hi Clive > Thank you for your help. Are there tools like Ethereal to trace the PPP = > establish procedure, just in case, because first trials often need = > debugging.
Yes - Ethereal comes with PPP trace facilities. This works very nicely, and helped me figure out what was going on between embedded target and Windows server. > Your hint for commercial m2m. I investigated a little bit. In Europe the = > most established service is from SAGEM Dr.Neuhaus. To be able to = > communicate directly with the embedded device you need to know its IP = > address. Unfortunately GSM providers hide this ip behind firewalls and = > proxys. > Thats where the proprietary protocol of SAGEM helps. It encapsulates the = > IP address in an upper layer protocol. Therefore a tiny switching center = > server knows the devices IP address and can act as a router between the = > client application which is also from SAGEM. > The problem is, this switching center costs around 3500Euro for 100 = > ports (each device must have a port) and then some additional 25Euros = > per port above 100 ports. There are providers running this switching = > center and you can rent ports for a monthliy fee. > But the most blocking factor for us. We dont need to transfer data so = > frequently. For this GPRS solution you need some sort of GPRS modem, = > which you mentioned must be programmable with your application (in this = > case with the SAGEM protocol). > But we want a very cheap m2m solution. As most people have a bluetooth = > enabled phone today and our embedded device already has a OEM bluetooth = > module, we want to dial up through the phone with an ordinary = > (unfortunately more expensive) CSD data call. > Or did you thought of other cheaper commercial m2m solutions. Any hint = > is welcome? Also take a look at http://tinyurl.com/2blqeu. Wavecom are one of the major providers of m2m modules. In Europe, they are supported by Orange, see their m2m offering here: http://tinyurl.com/2dags3 . I've used this system and found it extremely convenient... Hope this helps, Clive Wilson _______________________________________________ lwip-users mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/lwip-users
