uint64 timestamp		# time since system start (microseconds)

uint8 primary_instance

uint8 instances_available

uint32 instance_changed_count
uint64 last_instance_change

uint32 accel_device_id
uint32 baro_device_id
uint32 gyro_device_id
uint32 mag_device_id

float32[9] combined_test_ratio
float32[9] relative_test_ratio
bool[9] healthy

float32[4] accumulated_gyro_error
float32[4] accumulated_accel_error
bool gyro_fault_detected
bool accel_fault_detected