Add missing operations to highlevel.py

[aholtzma]

This change plumbs in the missing read_stb() from tcpip.py to highlevel.py.

[MatthieuDartiailh]

Could you also add it to sessions.py to return return StatusCode.error_nonsupported_operation just like for other methods that may not be implemented by all backends ?

[MatthieuDartiailh]

ping @aholtzma

[MatthieuDartiailh]

@aholtzma I took the liberty to complete your work and also fix some related issues in tcpip. If anybody can test this on real instruments (I won't have access to any for a week), I would appreciate it.

[MatthieuDartiailh]

I tested this and it seems to work. I will merge. Since this was from my point of view the last release blocker, I would appreciate if some people could test before I cut the release. @greyltc @skrchnavy @tivek

bors r+

[bors[bot]]

Build succeeded

• continuous-integration/travis-ci/push

[tivek]

I am sorry for my late reply, I was on the road without the equipment. I can reserve time for later this week to test the new commit.

[MatthieuDartiailh]

That would be awesome @tivek. Thanks