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Length field as ASCII number? #81

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Knaldgas opened this issue Feb 4, 2022 · 0 comments

Knaldgas commented Feb 4, 2022

Trying to learn Rammbock.
Example of a message in this protocol:

\x020000165{"telNo":241,"et":"190521_152059.933","src":"F01-1","dst":"MFS","func":"DATINF","dateTimeGMT":"190521_152059.933","msToLocalTime":3600000,"timeZone":"Europe/Berlin"}0779320932\x03

I've managed to define the protocol:

New protocol   SDXP
u8      STX    2
chars   7    length
chars   165   json
chars   10    CRC
u8      ETX    3
End protocol

But that only works for this particular message.

The length is 7-character ASCII encoded integer, how can I use that for the json length (instead of the fixed 165)?
Is there a way to automatically calculate/validate the CRC (also ASCII encoded integer)?
Is this the right way to define this protocol?

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