The only problem with it is, that the code examples and instruction manual are entierly written in Chinese. They can be switched by sending commands over TCP or UDP. Resently I ordered a little board 50mm x 70mm with two relays. If you want to quickly setup your SR-201 without even starting a script or anything else, just check the protocol Config commands and e.g.Simple Client Application for SR-201 Ethernet Relay Board Many thanks to anyone who contributed to this knowledge base! Own Scripts python-config-script - A python script to manipulate the board's configuration.perl-config-script - A PERL script to manipulate the board's configuration by Christian DEGUEST.In addition to my Java code examples that are clearly intended as a replacement for the default VB and Delphi programs, I added a scripts directory that contains simpler more pragmatic approaches to the SR-201 communication scheme. Maven will create an executable JAR in each of the modules target directories. sr201-php-cloud-service - Example implementation of a cloud service back-end in PHP provided by hobpet following the findings of anakhaema.sr201-server - REST interface to change the state of the relays.sr201-client - Simple client with 8 toggle buttons to change the state of the relays.

sr201-config-client - Client to read and change the config of the board.This repo contains the following modules: Persistent relay state when power is lost : off.E.g., its static IP address can be changed. Over this connection the board can be configured. The board also listens to the TCP port 5111. Therefore querying the state of the relays has to be done over TCP. But it is noteworthy that the board will execute UDP commands, but it will never answer. Since UDP (port 6723) is not an end-to-end connection, there are no restrictions. To prevent starving, it will close TCP connection after they have been idle for 15 seconds. When connected over TCP (port 6722), the board will only accept 6 connections at a time. Or short, everything needed to allow TCP and UDP connections. The board supports the protocols ARP, ICMP, IP, TCP, UDP. Although, e.g., the SR-201-2 only has two relays, it also has an extension port with another 6 pins which can be switched, too. They all seem to work with the same chip and software. SR-201-2 - Plain board, two relays (mine).The same idea, switching relays over ethernet, resulted in at least four different models of the SR-201: Therefore, I created this repo to keep track of my findings regarding the SR-201-2. Simple Client Application for SR-201 Ethernet Relay Board

Sr-201 relay software download