IoT: Propose Requirement for IoT - BE Communication Message Structure

[nps5696]

1. Propose IoT device - ME/BE communication message / payload structure
2. Document the structure in MD file
3. Request implementation from Backend/Middleware team, the component where functinalty will be developed is DAL

[nps5696]

try not to spend too much time onf this ticket, make structs , add to MD , deliver your requirements to BE team

[EricJ-code]

Eric helped review this