I'm wondering why the inproc transport doesn't support NN_SNDBUF? Seems like all the machinery to check the queue size and return EAGAIN if there's no room is already in place, and so just wiring the setting of the NN_SNDBUF option value into the already-existing variable, overwriting the default 128k, would make it work. I'm happy to go create a pull request for this, but wanted to check first to make sure there's not some design decision I'm overlooking. thanks, --steve