Copy to clipboard in a captive portal

[J-M-L]

isn't that the same question as in

Copy to clipboard in a captive portal

Good afternoon, I am doing a project with an ESP8266 NodeMcu board. I want to edit the WifiManager library to add a button in which when pressed (with Android and Iphone) it must copy the MAC address of the ESP8266 board, but I don't know to start. I have seen several C ++ functions to use the ClipBoard, maybe there is a simpler way. For example: void toClipboard(HWND hwnd, const std::string &s){ OpenClipboard(hwnd); EmptyClipboard(); HGLOBAL hg=GlobalAlloc(GMEM_MOVEABLE,s.size()+1); i…