- set certs and keys after socket open() as required by offloaded TLSSocket
- Added more checks for invalid handshake test and removed google.com test as
as some modems (e.g. BG96) might contains root CA for google.com
Test case printed IP address. If ip address is null, IAR compiled binary fails.
Added check for printing null. If IP address is null, then it prints string 'null'.
The whole README.md had to be updated to match the internal Confluence documentation, which can now be locked. In the process I also updated any spotted mistakes in tests documentation, removed the obsolete TCPServer tests documentation and added a test which was missing from UDPSocket's main.