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    You encode it in some string format that the website at the remote end is expecting. Either as a HTTP parameter list, or as a JSON array string, or whatever is needed. Commented May 14, 2021 at 12:28
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    @Majenko could you give me a link or short explanation to get started on that one? Commented May 14, 2021 at 12:45
  • It looks like you've already decided on (or had imposed on you) JSON. So the simplest method is to use ArduinoJSON (arduinojson.org) to create the JSON string for you. Commented May 14, 2021 at 12:47
  • my StreamLib has CStringBuilder to print to string same way as you print to Serial Commented May 14, 2021 at 13:37
  • you could send it as an integer ... that UID in your code is 536f272f Commented May 14, 2021 at 15:06