Initial implementation of no_std-training app parts

[SergioGasquez]

Brief explanation of every project:

• part1: Read sensor values and prints them
• part2: Connects to wifi using env variables and does an http request
• part3: Creates an AP and wifi provisioning portal, once you enter the credentials on the portal it does an http request
• part4: Reads the sensor values and send them via mqtt (it doesnt have wifi provisioning)
• part5: Like part4 but with wifi provisioning
• part6: Adds a small ota example to part5

[bjoernQ]

Awesome! Thanks for all the effort

I think I would change a few things

• part1: Read sensor values and prints them
• part2: Connects to wifi using env variables and does an http request => maybe use an http library like edge-http or reqwless to make things a bit simpler - manual http is a lot of noise
• part3: Creates an AP and wifi provisioning portal, once you enter the credentials on the portal it does an http request => I would move this to part5 (well it's there but maybe just leave this part out, might be confusion at this point)
• part4: Reads the sensor values and send them via mqtt (it doesnt have wifi provisioning)
• part5: Like part4 but with wifi provisioning
• part6: Adds a small ota example to part5

[MabezDev]

Thank you! I'll probably take a few iterations on this, but this is some initial feedback for you to address :)

[jessebraham]

I was also going to recommend getting rid of lib.rs, but looks like @MabezDev beat me to it. To build on this though, we should just move src/bin/main.rs to src/main.rs for each project to simplify the directory structure a bit, and then we can remove the [[bin]] sections from each Cargo manifest as well.

Additionally:

• Do we want to de-duplicate .gitignore and just move it to the root or something?
• Do we want to use a Cargo workspace so we can avoid duplicating the configuration for each part?

Still have more reviewing to do, will likely have more comments 😅

[MabezDev]

Overall it's looking good!

I think my only comment now would be about the module/task structure of the tasks leading up to part 6. I'm really pleased with how everything looks in part6, I think we should make modularization and splitting things into its own task(s) part of all parts except for part 1 (just because its so simple).

I want the focus of main.rs to be on the new content we're trying to teach in the current part, there's a lot of noise in some of these parts because previous parts are all loaded into main.rs.

After that's complete, I think I'm happy to approve this on my side!

[MabezDev]

Thanks for your continued effort here. I think this is looking great!

LGTM, I think this is more than enough to start thinking about the write up now!

[SergioGasquez]

Thanks for your continued effort here. I think this is looking great!

Thank you for all the feedback and input during this long review process!

[jessebraham]

Still working on reviewing the code itself (there's lots of it 😩) but a few small comments to get started