new_contents: #!/usr/bin/env python
  import os
  import sys
  import numpy as np
  os.environ['ZMQ'] = '1'
  
  from common.window import Window
  import cereal.messaging as messaging
  
  # start camerad with 'SEND_ROAD=1 SEND_DRIVER=1 SEND_WIDE_ROAD=1 XMIN=771 XMAX=1156 YMIN=483 YMAX=724 ./camerad'
  # also start bridge
  # then run this "./receive.py <ip>"
  
  SCALE = 1
  XMIN = 771
  XMAX = 1156
  YMIN = 483
  YMAX = 724
  H, W = ((YMAX-YMIN+1)//SCALE, (XMAX-XMIN+1)//SCALE)
  
  if __name__ == '__main__':
    cameras = ['roadCameraState', 'wideRoadCameraState', 'driverCameraState']
    sm = messaging.SubMaster(cameras, addr=sys.argv[1])
    win = Window(W*3, H)
    bdat = np.zeros((H, W*3, 3), dtype=np.uint8)
  
    while 1:
      sm.update()
      for i,k in enumerate(cameras):
        if sm.updated[k]:
          bgr_raw = sm[k].image
          dat = np.frombuffer(bgr_raw, dtype=np.uint8).reshape(H, W, 3)[:, :, [2,1,0]]
          bdat[:, W*i:W*(i+1)] = dat
      win.draw(bdat)
  
  
subject: add script to receive camerastream supported by camerad