The Crazyflie log system is design in such a way that the copter firmware is mostly independant from the client and all information required to get the log system to work are communicated at connection time. The copter contains a table of content of all the variable possible to log. The client retrieve the list at connection time. The client then program in the copter log packets (ie. list of variable to log at the same time) to be sent back at regular interval.

This mechanism is used both for regular log operation (ie. user requested log to inspect and debug flight data) but also to update indication in the GUI application.