Arduino Micro/ESP8266 virtual keyboard (finish incomplete project)

I have a part built project (designed by another freelancer on this network who is no longer contactable) which I would like to complete it. The project uses an Arduino Micro and an ESP8266 as a webserver, when a command is sent via the local network from my vMix (video streaming software) the Arduino sends a 'pageup' keyboard comman to the laptop that is connected to the usb port on the Arduino which advances a PowerPoint to the next slide. The main purpose of this is to allow clients to bring their laptop (containing a powerpoint presentation) into our video studio and be able to use just use one remote control to control the recording AND advance their slides rather than two. The remote we give them is connected to another PC. This PC runs the vMix software which luckily has the capability to map one of the buttons on the remote control to some VB code (which we can use for this). I know this all sounds a bit crazy but it totally solves a problem so I am not looking to discuss other options - just finish this project. See [login to view URL] for my original post and [login to view URL] for a post on the software manufacturers forum. The set-up so far which has been proved to work (see [login to view URL]) at the developer's end includes: - Arduino Micro +10K resistor - ESP8266 and SparkFun FTDI SmartBasic programmer - .lua file (see below) to be uploaded to ESP8266 via ESPlorer java program after being flashed with NodeMCU flasher - Set-up diagram here [login to view URL] --------- [login to view URL]([login to view URL]) [login to view URL]("SSID","WiFipassword") print([login to view URL]()) pin_out = 3 US_TO_MS = 1000 [login to view URL](pin_out, [login to view URL]) [login to view URL](pin_out, [login to view URL]) srv=[login to view URL]([login to view URL]) srv:listen(80,function(conn) conn:on("receive", function(client,request) local buf = ""; local _, _, method, path, vars = [login to view URL](request, "([A-Z]+) (.+)?(.+) HTTP"); if(method == nil)then _, _, method, path = [login to view URL](request, "([A-Z]+) (.+) HTTP"); end local _GET = {} if (vars ~= nil)then for k, v in [login to view URL](vars, "(%w+)=(%w+)&*") do _GET[k] = v end end buf = buf.."<h1> ESP8266 Web Server</h1>"; buf = buf.."<p>GPIO0 <a href=\"?pin=SND\"><button>Send Key</button></a></p>"; local _on,_off = "","" if([login to view URL] == "SND")then [login to view URL](pin_out, [login to view URL]); [login to view URL](200 * US_TO_MS); [login to view URL](pin_out, [login to view URL]); end client:send(buf); client:close(); collectgarbage(); end) end) ---------- I have managed to accidentally blow a ESP8266 whilst flashing it (didn't realise that the programmer is 5v and the ESP8266 is 3.3v) so have not been able to proceed further at this stage until the replacement and a logic level converter board arrives :( The help I need is 1. converting the above script to be triggered by a simple url call from my software, e.g. ------- Dim webClient As New [login to view URL] Dim result As String = [login to view URL]("http://IP-of-Ardduino/send-pageup-to-laptop") ------- and 2. working out what needs to be added to the Arduino to emulate a keyboard when connected via USB. This project was referenced in the original project communications [login to view URL] I have also seen this [login to view URL] finally... 3. To support me getting it all working and operational. Thank you! Alex