Astarte.Core.Device.encode_device_id

You're seeing just the function encode_device_id, go back to Astarte.Core.Device module for more information.
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encode_device_id(device_id)

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Specs

encode_device_id(device_id :: device_id()) ::
  encoded_device_id :: encoded_device_id()

Encodes a device id with the standard encoding (Base64 url encoding, no padding). The device id must be exactly 16 bytes (128 bits) long.

Returns the encoded device id.