![\"esp](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2015\/09\/esp-client-vs-server.png?resize=420%2C280&quality=100&strip=all&ssl=1\")
<\/p>\nIn this project\u00a0you\u2019re going to\u00a0make two ESP8266 talk with each other.<\/p>\n
How it works? You’re going to\u00a0set one ESP as an Access Point (Server) and another ESP as a Station (Client). Then they’ll establish a wireless communication and the Client sends a message to the Server saying “Hello World!”.<\/p>\n
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Before continue reading this project, please complete\u00a0the following tutorials:<\/p>\n
If you like the ESP and you want to do more projects\u00a0you can read my eBook Home Automation using ESP8266 here<\/a>.\u00a0Let’s get started!<\/strong><\/p>\n Here’s the hardware that you need to complete\u00a0this project:<\/p>\n You can use the preceding links or go directly to MakerAdvisor.com\/tools<\/a> to find all the parts for your projects at the best price!<\/p> The schematics for this project are very straight forward. You only need to establish a serial communication between your FTDI programmer and your ESP8266 to upload some code. (Repeat the schematics below for the Client and Server)<\/p>\n I recommend using the ESPlorer program created by 4refr0nt\u00a0to create and save Lua files into your\u00a0ESP8266.<\/p>\n Follow these instructions to download and install ESPlorer:<\/p>\n Don’t forget that first you need to flash both your\u00a0ESPs with NodeMCU firmare<\/a>. Copy and paste the code below into ESPlorer.<\/p>\n Summary:<\/strong> The ESP Server acts as an Access Point and it has its own SSID=test and Password=12345678. The server is continuously listening for a connection, when it successfully establishes a connection and receives a message prints that string on the serial monitor.<\/p>\n View raw code<\/a><\/p>\n When you open the ESPlorer you should see a window similar to the preceding Figure, follow these instructions to send commands to your ESP8266:<\/p>\n Then you simply click the button\u00a0Save to ESP <\/strong>and save your file with the name “init.lua”.\u00a0Everything that you need to worry about or change is highlighted in red box in the following Figure.<\/p>\n Having your ESP flashed with NodeMCU. Copy and paste the code below into ESPlorer. Summary:<\/strong> The ESP Client\u00a0acts as a Station\u00a0and it is continuously looking\u00a0for an Access Point. When the Client finds the Server establishes a communication and sends a message “Hello World!” every 5 seconds.<\/p>\nParts List<\/h2>\n
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![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2015\/01\/ESP01v0.jpg?resize=224%2C224&quality=100&strip=all&ssl=1\")
<\/a><\/p>\n![](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/10\/header-200.png?w=1200&quality=100&strip=all&ssl=1\")
<\/a><\/p>\nSchematics (3.3V FTDI\u00a0Programmer)<\/h2>\n
![\"ESP-Bitcoin-price_bb\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2015\/03\/ESP-Bitcoin-price_bb.png?resize=588%2C216&quality=100&strip=all&ssl=1\")
<\/p>\nDownloading ESPlorer<\/h2>\n
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![\"esplorer](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2015\/02\/esplorer-start.png?resize=424%2C316&quality=100&strip=all&ssl=1\")
<\/p>\nWriting Your\u00a0Server Script<\/h2>\n
-- Rui Santos\n-- Complete project details at http:\/\/randomnerdtutorials.com\n-- ESP8266 Server\n\nprint("ESP8266 Server")\nwifi.setmode(wifi.STATIONAP);\nwifi.ap.config({ssid="test",pwd="12345678"});\nprint("Server IP Address:",wifi.ap.getip())\n\nsv = net.createServer(net.TCP) \nsv:listen(80, function(conn)\n conn:on("receive", function(conn, receivedData) \n print("Received Data: " .. receivedData) \n end) \n conn:on("sent", function(conn) \n collectgarbage()\n end)\nend)\n<\/code><\/pre>\n\tUploading Your Lua Script<\/h2>\n
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![\"esplorer\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2015\/09\/esplorer.png?resize=737%2C372&quality=100&strip=all&ssl=1\")
<\/p>\nWriting Your Client\u00a0Script<\/h2>\n
-- Rui Santos\n-- Complete project details at http:\/\/randomnerdtutorials.com\n-- ESP8266 Client\n\nprint("ESP8266 Client")\nwifi.sta.disconnect()\nwifi.setmode(wifi.STATION) \nwifi.sta.config("test","12345678") -- connecting to server\nwifi.sta.connect() \nprint("Looking for a connection")\n\ntmr.alarm(1, 2000, 1, function()\n if(wifi.sta.getip()~=nil) then\n tmr.stop(1)\n print("Connected!")\n print("Client IP Address:",wifi.sta.getip())\n cl=net.createConnection(net.TCP, 0)\n cl:connect(80,"192.168.4.1")\n tmr.alarm(2, 5000, 1, function() \n cl:send("Hello World!") \n end)\n else\n print("Connecting...")\n end\nend)\n<\/code><\/pre>\n\t
![\"data](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2015\/09\/data-received-esp8266.png?resize=980%2C379&quality=100&strip=all&ssl=1\")
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