Summary: This is a well written draft, and I think it's ready from an Artart perspective.

Nits:

Section 2. s/estabilished/established


Section 3.2. There appears to be a word missing in the following introductory phrase:

Current: "When receives a test packet, the micro OWAMP Session-Receiver MUST ..."

Perhaps: "When it receives..."


Section 5. Subject-verb agreement (s/use/uses):

Current: "The micro Session-Sender also use ..."