Initializes the Machnet library for interacting with the Machnet sidecar.
This function sets up the necessary components to allow communication and control
over the Machnet sidecar.
It should be called before making any other calls to the Machnet library.
Receives a pending message from a remote peer over the network.
This function attempts to receive data from a specified Machnet channel. It uses the provided
Machnet channel (channel) and fills the given buffer (buf) with the received data.
The flow parameter will be populated with the flow information of the sender.