On Thu, Jun 6, 2013 at 3:58 AM, Dmitry Eremin-Solenikov
<dbarysh...@gmail.com> wrote:
>
> 1) I suggest for 's' to be used only as a packet start character.
> Let's pick up something like
> SLIP/PPP have:
>
> For transmitter:
> 's' = start of the packet. If it happens in the packet, transmitter
> should replace it. 's' => 'ec'
> 'e' = escape char. If it happens in the packet, replace it with 'e' => 'ee'
>
> For the receiver:
> 's' => start of the packet. If it is found, finish the current packet
> (possibly truncated/damaged)
> and start parsing new packet
> 'e' => escape char. Replace:
> 'ee' => 'e'
> 'ec' => 's'
>
> After 's' comes protocol version ('s' '2').
>
> 2) Packet length. I would suggest to change the protocol a bit:
> After command id comes packet length (after unescaping all characters
> if we agree to escape them).
> Thus it will be possible to skip 'till the next packet'.
>
> Examples:
> Command: 0x00[=NOOP] 0x00[=no args]
> Response: 0x80[=rNOOP] 0x01[=1 byte] 0x80[=SUCCESS]
>
> Command: 0x04[=XMIT] 0x33[=len] .....[=0x33 bytes]
> Response: 0x84[=rXMIT] 0x02[=2 bytes] 0x80[=status] 0xed[=level]
>
I've recently heard about using COBS for this:
http://en.wikipedia.org/wiki/Consistent_Overhead_Byte_Stuffing
I've heard about people using this on the econotags for offloading
serial data and it has worked well for them.
-Mar.
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