Implement LOG functionality

[ataffanel]

The Crazyflie has a log functionality that allows to setup "log blocks" which are block of variables that can be scheduled to be received at regular interval. The log protocol documentation is in the Bitcraze wiki: https://wiki.bitcraze.io/doc:crazyflie:crtp:log

This would be the start of making the ios client a bit more a 'serious' Crazyflie client: to implement those more complex protocol it would be beneficial to make a Crazyflie object and to encapsulate all communication and logic in it. The same way it is done in the Python and Android client. I created ticket #10 for it.

This functionality has been discussed in #7 but will be useful for #9.

[EMart002]

Hi @ataffanel, as far as i've read, the log allowes the client to request given data in an open structure. I'm a bit confused how to request those. If you could point me into the right direction and maybe point me to that specific feature in the Android source code, that would be really great. As you may have see, i've started implementing reading the logable id's and i'm really looking forward in implementing this :)

[ataffanel]

Hi @EMart002, the log is implemented there in the android client: https://github.com/bitcraze/crazyflie-android-client/tree/master/src/se/bitcraze/crazyflie/lib/log. I linked the documentation to the wiki in the ticket description.

Once you have the TOC, you can setup "log block" which are a list of variable to log together in a packet, you can then start the logging for this block and the packet will be sent by the Crazyflie at regular interval.