Create my own QR code

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If I understand correctly, you would like to generate a configuration QR code from which multiple devices can be configured as described here. Is that right?

That QR code uses a json representation of the settings with a structure such as

{
  "general": {
    "protocol": "google_sheets",
    "constraint_behavior": "on_finalize"
  },
  "admin": {
    "edit_saved": false
  }
}

There is no encryption, the json is just compressed with zlib. You can read more about the implementation at https://github.com/opendatakit/collect/issues/781 and there's a ticket to document this more thoroughly at https://github.com/opendatakit/docs/issues/15

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