Listing 2. Sensor Data Processing Pipeline

# Start the data processing pipeline
# (with cpf ignoring SIGINT,SIGTERM)
   eval "cat $dig_data_stream | \
      tee $raw_file | \
      cpf -i -v$cpf_verbosity $cpfparams \
      > $output_file &"
   # Enable the dig channel
   set_hardware 'echo $dig_channel \
     channelEnable ena | mapper 2>&1'