msg: new sensor_hygrometer msg

msg/CMakeLists.txt

@@ -145,6 +145,7 @@ set(msg_files
 	sensor_gyro.msg
 	sensor_gyro_fft.msg
 	sensor_gyro_fifo.msg
+	sensor_hygrometer.msg
 	sensor_mag.msg
 	sensor_preflight_mag.msg
 	sensor_selection.msg

msg/sensor_hygrometer.msg

@@ -0,0 +1,8 @@
+uint64 timestamp          # time since system start (microseconds)
+uint64 timestamp_sample
+
+uint32 device_id          # unique device ID for the sensor that does not change between power cycles
+
+float32  temperature      # Temperature provided by sensor (Celcius)
+
+float32 humidity          # Humidity provided by sensor