Add support for Exposure Control / Spot Meter

[tcamise-gpsw]

Discussed in #48

^{Originally posted by cornemrc September 4, 2021}
Hello,
is there any option to control the exposure (previously known as spot meter function)?

One of the most important problems with the newer GoPro Cams is the unavailable option to keep the exposure locked in the newer cameras after turning them off and on again (it was possible with GoPro Hero 3 for example).

Once the cameras are in place I am unable to activate this new exposure setting because I cannot reach its back side. So it would be perfect to have a workaround by this API at least.

For a low energy consumption the Bluetooth LE would be the only option, the standard App needs too much power over Wifi.

Within this Bluetooth LE documentation (https://gopro.github.io/OpenGoPro/ble) I have found this which looks promising:

65 | Exposure select type | Liveview Exposure Select Mode | integer | 0: Disabled1: Auto2: ISO Lock3: Hemisphere
66 | Exposure select x | Liveview Exposure Select: y-coordinate (percent) | percent | 0-100
67 | Exposure select y | Liveview Exposure Select: y-coordinate (percent) | percent | 0-100

But as far as I can see those are "status codes", so some kind of "read only"?

Is there any way to do this already or is this planned?

[zsinba]

We need the same function control by the ble type.

[tcamise-gpsw]

closing as duplicate since it is now tracked by top level protoune ticket: #561