Update comments and README file to match the RFC 8951 initial support…

…. Removed magic number

Fix submodules

Fix submodules

IOT-921: disable http chunk

Downgrade cmake to 3.18.0 - for all components

Downgrade cmake to 3.18.0

Downgrade cmake to 3.18.0

Remove submodules created folders

Fix openssl compatibility between 1.x and 3.x. Added some build args …

…used to specify custom openssl include and lib

Improve docs