This example device service simulates a 3-axis gyro sensor. It returns rotation rate data on each axis in a range -250 to +250 degrees per second. The example illustrates the use of the resourceCommand construct in a device profile to aggregate device resources.
The environment variable CSDK_DIR should be set to a directory containing the C SDK include files and libraries.
Set LD_LIBRARY_PATH to $CSDK_DIR/lib
gcc -I$CSDK_DIR/include -L$CSDK_DIR/lib -o device-gyro device-gyro.c -lcsdk
A device profile for the simulated device is provided in the res directory. This will be uploaded to core-metadata by the device service on first run.
The supplied configuration file res/configuration.toml includes a definition for a single gyro device. No protocol properties are defined for the device - the example runs on the basis of one device per service instance.
An EdgeX system containing at least a database and the core-data and core-metadata services must be running. The configuration file must be edited to reflect the locations of the core-data and core-metadata services.
./device-gyro -c res
To take a set of readings from the gyro:
curl 0:59999/api/v2/device/name/Gyro/rotation
This returns an Event containing three Readings representing the three axes of measurement.