[feature-wisun] Add getsockopt option to read network property #12883
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Summary of changes
This is backport of the PR #12522
Add getsockopt options NSAPI_LATENCY and NSAPI_STAGGER to read
network specific timing constraints from socket.
-NS_LATENCY returns estimated latency to given address.
-NSAPI_STAGGER returns estimated initial delay that application
should wait before transmitting data to network.
Application can use the new options to avoid network congestion by
adjusting transmission delays and retry timeouts.
Add wrappers to make API usage easier:
-get_rtt_estimate_to_address
-get_stagger_estimate_to_address
Impact of changes
Migration actions required
Documentation
Pull request type
Test results
Reviewers
@ARMmbed/mbed-os-mesh , @TuomoHautamaki, @teetak01