Freenove Raspberry Pi 2 Model B, Manual

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97 Chapter 4 Robot Dog
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Client
The client can receive video data and commands from the server, and can send commands to the server. And
it can run on different systems, such as windows, macOS and so on. However, you need to install related
software and libraries when running it.
Part of client code is as below:
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def turn_on_client (self,ip):
self .client_socket1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self .client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print (ip)
def turn_off_client (self):
try :
self .client_socket.shutdown(2)
self .client_socket1.shutdown(2)
self .client_socket.close()
self .client_socket1.close()
except Exception as e:
print (e)
def receiving_video (self,ip):
stream_bytes = b ' '
try :
self .client_socket.connect((ip, 8000))
self .connection = self .client_socket.makefile( 'rb' )
except :
#print ("command port connect failed")
pass
while True :
try :
stream_bytes= self .connection.read(4)
leng=struct.unpack( 'L' , stream_bytes[:4])
jpg= self .connection.read(leng[0])
if self .is_valid_image_4_bytes(jpg):
if self .video_flag:
self .image = cv2.imdecode(np.frombuffer(jpg, dtype=np.uint8),
cv2.IMREAD_COLOR)
if self .ball_flag:
self .Looking_for_the_ball()
self .video_flag= False
except BaseException as e:
print (e)
break