I recently took part on the SW pilot for the BCT's British Bat survey - https://www.bats.org.uk/our-work/national-bat-monitoring-programme/british-bat-survey
To setup the AM's used for the BBS, a "Chime" consisting of 4 notes was played from a device (phone .. etc) and this configured the AM. https://www.bats.org.uk/our-work/national-bat-monitoring-programme/british-bat-survey/configure-your-audiomoth
I "assume" this was done with some custom firmware?, waiting for specific tones? As I suspect that just 4 notes cannot carry all the config. info needed? Can anyone confirm?
Just asking, as being able to re-configure a AM in the field, with just a phone was very useful.