What is the difference between a frame and an envelope in the context of rabbitmq-c. The examples seem to use them interchangeably, and its not clear what the difference is.
A frame (or amqp_frame_t) is an AMQP protocol level construct. It represents a unit of transmission over the network can contain a number of different payloads.
An envelope (amqp_envelope_t) is a complete received message. An envelope is usually constructed from 3 or more frames. (One method, one header, and one or more body frames).