Hi,

I know its alot of data ;) - but i am doing it pretty often, sometimes the data is only 10K - but every week it will be around 100-1024K.

Ofcourse i could implement a normal protocol with packets with a strong CRC and all - and this was my first approach since i do this normally when running ordinary seriel communications.

The problem as i see it it has to be "streaming" on way - no ACK-NAK ping ponging protocol - because the switching sides can take aloooooong time.

A streaming protocol (or even HDLC like) would be ok, but my little processor is not able to catch up in a streaming mode - not even at 9600! - and if i lets say calculate crc on a complete block - it will loose 30 streaming characters...

But, if a ping protocol is ok to some point, that would be great ? do you have experience with the perfomance on such a protocol and GSM ?