Robus - Part 1: The transmission and reception management

Luos engine library provides a complete mailing system between services.

The role of Robus is to transmit and receive messages to and from other nodes, through the network.

Transmission

When Luos_send API is called, the message to transmit is stored in the Luos engine's message allocator msg_alloc.c.

Depending on the target of this message, Luos engine will pass it to a local service (localhost network) or to a network layer, in this case, Robus.

Depending on the state of the network, Luos will be able to ask the Luos engine's message allocator if a Tx message is available, and send it if there is one.

At the beginning of the transmission, Robus will check if there is any collision with another node transmitting at the same time.

At the end of transmission, Robus will add some sanity checks and ACK management.

Check the file transmission.c for a better understanding of the transmission process and functions.

Reception

Robus reuses the format of the Luos engine's messages as the base of its protocol. Robus uses a multipoint network, so any transmitted messages will be broadcasted to any nodes in the network.

During message reception, Robus will use the message header and the information of the node it's running on to know whether it needs to keep this message or not.

Eventually, at the end of the message, Robus will check the integrity, send back an ACK if needed, and store the message into the Luos engine's allocator.

Check the file reception.c for a better understanding of the reception process and functions.