startLog logs incoming feedback data to disk
This method starts logging of incoming module feedback.
Logging is done in the background and does not interfere
with ongoing operations.
Note that all logs are initially streamed into a binary
streaming format, which gets converted into a readable
format by stopLog. Alternatively, binary logs can also be
converted manually by convertGroupLog, which can be useful
after a system crash or if different formats are needed.
If the log is empty, make sure that the feedback polling
rate is set and that the hardware is turned on.
A repeated call to startLog will stop active logging, and
restart in a new file. No data will be lost. Doing this
has little overhead, and can be useful to split log-files
in a long running application.
'Directory' ('dir') Parameter
'<name>' sets the relative or absolute directory of the
(default) current working directory
'FileName' ('file') Parameter
'<name>' sets the filename for the binary file, as well as
any later converted file such as mat or csv.
(default) a generated unique name based on the timestamp
log = group.stopLog();