webcommands for robots using nodejs server

scripts/http/webcommands/minetest_webcommands.js

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+// listen to web request and pass it to minetest, rnd 2018
+
+const http = require('http');
+
+const hostname = '192.168.0.10' //write address of your router (it will be accessible from internet then if you open firewall for nodejs process)
+const port = 80;
+
+var webreq = ""
+
+// take request from web and pass it to minetest 
+const server = http.createServer((req, res) => {
+	res.statusCode = 200;
+	res.setHeader('Content-Type', 'text/plain');
+
+	if (req.url == '/favicon.ico') return // prevent passing this as request
+
+	var pos = (req.url).indexOf("/MT"); 
+	if (pos >=0) { // did request come from minetest? then answer with latest request
+		res.write(webreq);webreq = "";res.end();return
+	}
+
+	//process web request and store it
+	var ip = req.connection.remoteAddress;
+	webreq = ip + ' ' + req.url
+	res.write('request received: ' + webreq);res.end(); // acknowledge request
+	return
+});
+
+server.listen(port, hostname, () => {
+  console.log(`Server running at http://${hostname}:${port}/`);
+});

scripts/http/webcommands/webcommands.lua

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+-- webcommands : access url like: 192.168.0.10/hello_world 
+
+--[[ instructions:
+	1.download nodejs server from
+		https://nodejs.org/dist/v10.14.2/node-v10.14.2-win-x86.zip
+	2. run nodejs server using run.bat
+		:loop
+			node --inspect myprogs/minetest_webcommands.js
+		goto loop
+	3. run robot and type 'http://192.168.0.10:80/hello this is a test' into browser
+	(you need to write your router address here, i.e. ip accessible from  internet OR lan address)
+--]]
+
+if not fetch then
+	fetch = _G.basic_robot.http_api.fetch;
+	state = 0 -- ready to fetch new command
+-- WARNING: this is run outside pcall and can crash server if errors!
+	result = function(res)  -- res.data is string containing result
+	  state = 0
+	  if not res.succeeded then self.label("#ERROR: data couldn't be downloaded :\n" .. minetest.serialize(res) ) return end
+	  if res.data == "" then return end
+	  local req = res.data; req = string.gsub(req,"%%20","S")
+	  if res.data then self.label(os.clock() .. ' received cmd : ' .. res.data) end
+	end
+
+end
+
+if state == 0 then
+	fetch({url = "http://192.168.0.10/MT", timeout = 30}, result)
+	state = 1
+end