Debugging

You can retrieve sensor status and configuration information on your target from /dev/sensor.

When the sensor service is running, you can query status and configuration information on each of the sensors that are in your sensor configuration file from /dev/sensor.

To query this information, use the cat command on the sensor unit you would like information on.

1. On the target where you're running the sensor service, confirm that the sensor service recognizes all your sensors.

   Do so by using the ls command on /dev/sensor. For example, you may see the following if your sensor configuration file included configuration for one camera sensor, two interim data sensors, and seven sensors:

   # ls /dev/sensor         
   camera1    data1      data2      sensor2    sensor3    sensor4    sensor5    sensor6    sensor7    sensor8
             

   Each sensor is listed in the format of sensor_typesensor_unit where sensor_type corresponds to the type of sensor (camera, data, or sensor), and sensor_unit corresponds to the enumerator as specified in the sensor configuration file. For example, an entry in the sensor configuration file of the following:

   begin SENSOR_UNIT_1
       type = usb_camera
       name = front
       position = 0, 0, 0
       direction = 0, 0, 1
       address = /dev/usb/io-usb-otg, -1, -1, -1, -1
   end SENSOR_UNIT_1
             

   results in camera1 in your list when you use the ls command on /dev/sensor.

   Entries in your interim data configuration file result in datainterim_data_unit. For example:

   begin INTERIM_DATA_UNIT_1
       num_buffers = 5
       buffer_size = 65535
       queue_depth = 5
       data_format = SENSOR_FORMAT_USER_DATA
       data_id = 1
       name = tracked_objects
       position = -25.2, 13.25, -7.278
       direction = 128.9, -221, 17.98
   end INTERIM_DATA_UNIT_1
                  
             

   results in data1 in your list when you use the ls command on /dev/sensor.
2. Use the cat command on the sensor you want to query. For example:

   # cat /dev/sensor/sensor2
             

   The output from this command depends on the state of the sensor. For example, if the sensor is not streaming any data, you may see this:

   # cat /dev/sensor/sensor2
   Stream Info: refCount 0 status 0 # underflows 0
             

   If the sensor is streaming data, you may see this:

   # cat /dev/sensor/sensor2 
   Stream Info: refCount 1 status 27 # underflows 0
   Stream State: size 5760 format 20 last time 12ac562326d adjust 0
   Q Info: pid 6094875 key 0 r/w 0 q 0 held 0 # queued 503 # overflows 0
   Pool Info: inUse 1 buf 852a000 phys 260704000 len 115200 refCount 1
   Pool Info: inUse 0 buf 82cb000 phys 260fce000 len 115200 refCount 0
   Pool Info: inUse 0 buf 82e8000 phys 260fb1000 len 115200 refCount 0
             

   Note: The format and information that you see in the output of your commands may vary depending on the type of sensor and its status.