Using the GoPro App and tcpdump on an android phone to decode the API for use in other programs.

• Power On: ​http://10.5.5.9/bacpac/PW?t=goprohero&p=%01
• Power Off: ​http://10.5.5.9/bacpac/PW?t=goprohero&p=%00

Not yet known:

• ​http://10.5.5.9/camera/PV?t=goprohero&p=%02
• ​http://10.5.5.9/camera/sx?=t=goprohero
• ​http://10.5.5.9/bacpac/se?=t=goprohero

$ curl 'http://10.5.5.9:8080/live/amba.m3u8'
#EXTM3U
#EXT-X-TARGETDURATION:1
#EXT-X-VERSION:3
#EXT-X-ALLOW-CACHE:NO
#EXT-X-MEDIA-SEQUENCE:2269
#EXTINF:0.33333,
amba_hls-5.ts
#EXTINF:0.33333,
amba_hls-6.ts
#EXTINF:0.33333,
amba_hls-7.ts
#EXTINF:0.33333,
amba_hls-8.ts
#EXTINF:0.33333,
amba_hls-9.ts
#EXTINF:0.33333,
amba_hls-10.ts
#EXTINF:0.33333,
amba_hls-11.ts
#EXTINF:0.33333,
amba_hls-12.ts

Enabling the preview with the phone allows you to connect with VLC to:

​http://10.5.5.9:8080/live/amba.m3u8

Cap mod

Always loosing the cap when plugged into USB, a bit of black electrical insulation tape for the resue: