Address string with tokenisation, refactoring, loopback s7 c example added. s7c write variable works

[thomas169]

1. Changed address string parsing as in last cancel PR null checking of token is performed via strlen poxy. Removed timer/sleep features from windows versions
2. Refactoring: reduced variable name verbosity, used more intermediate variables, and typically forwarded variable declarations to beginning of scopes, plus major refactoring on files relevant to next item.
3. Added a write->read loopback test for s7 using bool/int8/int16 types
   3a) Added I think most todos in write.c, drive_s7_packet.c, driver_s7_sm_write.c

Note write response return values are not checked (or used), nor tested with arrays of a write type, (think it will not work)

[sruehl]

@thomas169 is this still a WIP/Draft pull request? If yes I can mark it as such

[thomas169]

Yeh still WIP. Write arrays (e.g. UINT[2]) work, but not sure the way I implemented this is how it was intended to be. As write response items are still unchecked / unused it's still draft.

[chrisdutz]

Hi Thomas,

a general question ... could you be so kind and sign up for the dev@plc4x.apache.org list and tell us a bit about what you're up to?

Chris

[thomas169]

I already signed up, but sure, will message mailing list.

[sruehl]

out of curiosity: as you (@thomas169) marked it for ready for review and added changes to it 7 days after: is it done done yet? If so maybe I would suggest that @ottobackwards or @chrisdutz should do a final review then and merge et, as im not confident enough in the c-world :D

[thomas169]

its done in relation to the title. But any commits to my fork also come into this PR, hence the later 3 commits.