Integrators can declare read-only parameters in a per-board YAML file:
readonly_params.yaml.
There are two ways to define the read-only params:
- "block": default writable, explicitly list params to be locked
- "allow": default readonly, explicitly list params to be writable
Enforcement is activated by `param lock` in rcS after all startup
scripts have run, so board defaults and airframe scripts can still set
params during init.
The feedback via MAVLink uses the new
MAV_PARAM_ERROR_READ_ONLY as part of the PARAM_ERROR message.
50d24429ec