:param udp_package_max_size: 当前系统支持的最大 UDP 发送包大小,以 bytes 计算,默认为 65535 (在 macOS 下默认为 9126) :param mtu: Maximum Transmission Unit udp_package_max_size = 0xffff - (sizeof(IP Header) + sizeof(UDP Header)) = 65535-(20+8) = 65507 ref to: https://en.wikiped...
由于UDP包头占8个字节,而在IP层进行封装后的IP包头占去20字节,所以这个是UDP数据包的最大理论长度是2^16 - 1 - 8 - 20 = 65507字节。如果发送的数据包超过65507字节,send或sendto函数会错误码1(Operation not permitted, Message too long) 当视频分辨率(长*宽<65507时) 接收视频端: import cv2 from ...
MessageLengthError("message too long") elif no in (errno.WSAECONNREFUSED, errno.WSAECONNRESET, ERROR_CONNECTION_REFUSED, ERROR_PORT_UNREACHABLE): # in non-connected UDP ECONNREFUSED is platform dependent, # I think and the info is not necessarily useful. # Nevertheless maybe we should call ...
In contrast, User Datagram Protocol (UDP) sockets created with socket.SOCK_DGRAM aren’t reliable, and data read by the receiver can be out-of-order from the sender’s writes. Why is this important? Networks are a best-effort delivery system. There’s no guarantee that your data will re...
no = se.args[0]ifno == EINTR:returnself.write(datagram)elifno ==EMSGSIZE:raiseerror.MessageLengthError,"message too long"elifno == ECONNREFUSED: self.protocol.connectionRefused()else:raise 开发者ID:kenorb-contrib,项目名称:BitTorrent,代码行数:21,代码来源:udp.py ...
第一章,TCP/IP 协议套件和 Python 回顾,回顾了构成当今互联网通信的基本技术,从 OSI 和客户端-服务器模型到 TCP、UDP 和 IP 协议套件。本章将回顾 Python 语言的基础知识,如类型、运算符、循环、函数和包。 第二章,低级网络设备交互,使用实际示例说明如何使用 Python 在网络设备上执行命令。它还将讨论在自动化...
no = se.args[0]ifno == EINTR:returnself.write(datagram)elifno == EMSGSIZE:raiseerror.MessageLengthError,"message too long"elifno == ECONNREFUSED: self.protocol.connectionRefused()else:raise 开发者ID:kenorb-contrib,项目名称:BitTorrent,代码行数:21,代码来源:udp.py ...
UDP messages from unexpected sources can now be ignored by settingignore_unexpectedto True when callingdns.query.udp. Bugs fixed since 1.4.0: If/etc/resolv.confdidn't exist, we raised an exception instead of simply using the default resolver configuration. ...
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The only case for setting these options is testing multicasting via multiple UDP sockets. Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e. on Windows), it will be set on the socket. This will prevent anyone else from binding to our host/port for the duration of ...