Arancino Library uses a simple protocol, called Cortex, to communicate with the Arancino Module using multiple connection Interfaces (MQTT,Serial,Bluetooth). Cortex Protocol is designed to be easy to read and processed. Arancino Library, Arancino Module and Cortex Protocol are designed to be monodirectional and synchronous. In this scenario the Arancino Library within the microcontroller acts as master, and the Arancino Module as slave.
Each command sent using Cortex Protocol is composed by a command identifier and one or more parameters. Command identifiers and parameters are formatted inside a JSON and the message itself is compressed into a MessagePack. Each command sent will receive a response, formed by a Response Code and one or more returned values. The commands receive Response within a timeout interval. If no Response is received, the Command will be skipped.
As exaplained above, when an API function is called, a command is sent over the ArancinoInterface and a response is received.
More details about the command structure and relative responses may be found in the Cortex Protocol section.