SDLOG_ALGORITHM for selecting the crypto algorithm
SDLOG_KEY for selecting the key in keystore to use with the algorithm.
for symmetric algorithms which are currently supported, this is just a free
slot to be used, the key is generated at logging start
SDLOG_EXCH_KEY for selecting an RSA2048 key for encrypting the SDLOG_KEY
Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
- Generate a symmetric encryption key and a nonce value
- Use a public key in keystore to encrypt the symmteric key
- Write the encrypted key and the nonce value to disk into .ulgk, name matching with the encrypted log file
- use quick stream encryption to crypt the .ulg file contents
Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
By adding the sequence number we can avoid double triggering due to
command retransmissions. This is according to the mavlink spec for
MAV_CMD_IMAGE_START_CAPTURE.
VTOL planes are getting lift from the wing when flying in MC mode at
high speed. They (and some other drones) also get extra drag when
climbing and descending at high speed, corrupting the hover thrust
estimate.
To avoid this, two speed thresholds (vertical and horizontal) are defined
above which the sensitivity of the estimator is decreased by linearly
increasing the observation noise.
Using mixers on the IO side had a remote benefit of being able to
override all control surfaces with a radio remote on a fixed wing.
This ended up not being used that much and since the original design
10 years ago (2011) we have been able to convince ourselves that the
overall system stability is at a level where this marginal benefit,
which is not present on multicopters, is not worth the hazzle.
Co-authored-by: Beat Küng <beat-kueng@gmx.net>
Co-authored-by: Daniel Agar <daniel@agar.ca>
Currently only for the Z axis. If the current downward velocity is more
than twice the maximum allowed value, the emergency braking mode is
activated. In this mode, a higher vertical acceleration and jerk is used
until the vehicle stops moving.
* fix disable airspeed check with negative ASPD_FS_INTEG
* improve logic when nav velocity data is not good
* simplify logic. Reset integrator state when the check is not run.
EKF2 has a grace period of 10 seconds after boot where it doesn't need
to warn the user while the sensors (especially GNSS) are still
converging.
A connection to a GCS shouldn't skip this grace period but
an arming request should.
Jukka Laitinen