MCU Selection
The robot selection query (switch MCU, using the 4-byte code sMCU) is used by the client to inform the server which mcu it wants to control. For this, the query uses a single additional information field, [MCU_UNIQUE_NAME], containing the unique identifier the mcu used at server login. The query structure will be:
On a successful request, the server will return a positive control query. While if there's an error, the server will return one of the following error codes:
_NACK_InvalidQuery(uint8_t c=255) → If the query format is invalid: contains null-bytes, invalid header or tail sequences, or the query function code is not recognized._NACK_NoActiveMCU(uint8_t c=254) → If the variable[MCU_UNIQUE_NAME]is empty (!s-sMCU--e!), or if the given[MCU_UNIQUE_NAME]identifier does not exist on the server database.
As such, the communication schema for this query type will look like the one illustrated on the following diagram.
