我正在编写一段代码,其中 arduino 从加速度计读取数据,将其传递给 python 脚本,然后运行 python 的计算机通过套接字连接将数据发送到另一台计算机。我编写了可以一次发送和接收一条消息的代码,速度很慢,但是一旦我基本上尽可能快地执行(大约 100Hz),服务器端就只打印第一条消息,但不再打印。
这是我的服务器端的代码:
import socket
class server:
def __init__(self, PORT=9077, MAX_CONNECTIONS=1000, BUFF_SIZE=1024):
self.s = socket.socket()
self.HOST = socket.gethostbyname(socket.gethostname())
self.PORT = PORT
self.MAX_CONNECTIONS = MAX_CONNECTIONS
self.BUFF_SIZE = BUFF_SIZE
self.s.bind((self.HOST, self.PORT))
self.s.listen(self.MAX_CONNECTIONS)
self.recievingData = False
print("Starting a server")
print("IP: " + str(self.HOST))
print("Port: " + str(self.PORT))
def recieveData(self):
self.recievingData = True
while self.recievingData:
print("Waiting for data")
c, addr = self.s.accept()
print(addr)
data = b''
part = c.recv(self.BUFF_SIZE)
data += part
while len(part) > self.BUFF_SIZE:
# print("looping")
part = c.recv(self.BUFF_SIZE)
print(len(part))
data += part
print(data)
c.close()
def stopRecieving(self):
self.revievingData = False
new_server = server()
new_server.recieveData()
和客户端:
class client:
def __init__(self, HOST="192.168.0.51", PORT=9077):
self.s = socket.socket()
self.HOST = HOST
self.PORT = PORT
self.s.connect((self.HOST, self.PORT))
def send_message(self, message):
message = message.encode()
sent = self.s.sendall(message)
print(sent)
我基本上只是在每次有新数据要发送时调用 send_message 。
有没有办法提高服务器从同一客户端接收消息的速度?我需要创建多个线程来接收数据吗?
我的解决方案是使用 UDP 协议,您可以在不检查数据是否已收到的情况下发送消息。这是通过在客户端和服务器端使用
socket.socket(type=SOCK_DGRAM)
以及使用 self.s.recvfrom(self.BUFF_SIZE)
从客户端接收数据和使用 self.s.sendto(str(message).encode(), (host, port))
发送数据来实现的。这样,客户端和服务器之间就没有握手,并且运行速度更快。
您只需要对输入数据进行一些错误检查。
作为参考,这是我完整更新的代码:
import socket
from socket import SOCK_DGRAM, SO_REUSEADDR
import numpy as np
import threading
class client:
def __init__(self, HOST="192.168.0.51", PORT=9077):
self.s = socket.socket(type=SOCK_DGRAM)
self.HOST = HOST
self.PORT = PORT
def send_message(self, message):
self.s.sendto(str(message).encode(), (host, port))
class server:
def __init__(self, PORT=9077, BUFF_SIZE=1024):
self.s = socket.socket(type=SOCK_DGRAM)
self.HOST = socket.gethostbyname(socket.gethostname())
self.PORT = PORT
self.MAX_CONNECTIONS = MAX_CONNECTIONS
self.BUFF_SIZE = BUFF_SIZE
self.s.bind((self.HOST, self.PORT))
# self.s.listen(self.MAX_CONNECTIONS)
self.recievingData = False
self.recievedData = np.zeros((1,4))
self.thread = threading.Thread(target=self.recieveData)
self.thread.start()
# self.s.setblocking(0)
self.startRecieving()
print("Starting a server")
print("IP: " + str(self.HOST))
print("Port: " + str(self.PORT))
def startRecieving(self):
self.recievingData = True
self.recievedData = np.zeros((1,4))
self.thread = threading.Thread(target=self.recieveData)
self.thread.start()
print("Started reading data")
def stopRecieving(self):
self.recievingData = False
self.thread.join()
print("Stopped reading data")
def recieveData(self):
self.recievingData = True
while self.recievingData:
# print("Waiting for data")
part, addr = self.s.recvfrom(self.BUFF_SIZE)
# print(part, addr)
data = b''
data += part
while len(part) > self.BUFF_SIZE:
# print("looping")
part = self.s.recvfrom(self.BUFF_SIZE)
# print(len(part))
data += part
self.lastData = data
print(data)
as_float = np.array([[float(x.strip()) for x in data.decode().split(',')]])
self.recievedData = np.vstack((self.recievedData, as_float))