Decode Base64 data

[paolomorabito (Paolo)]

Hi, I have a sensor

- platform: template
  sensors:
    trasmettitore_rc_potenza:
      friendly_name: "Potenza Trasmettitore RC"
      unit_of_measurement: "W"
      value_template: >
        {{ state_attr('sensor.trasmettitore_rc', 'PARAM')[5] }}

The value is Base64. Is there a way to decode it directly on the value_template parameter?

E.g.

IDEwMDA= -> 1000

Thanks

[123 (Taras)]

@paolomorabito

a way to decode it directly

Use base64_decode.

Example:

Specifically for your sample value:

[paolomorabito (Paolo)]

Thank you! It works!

[markusBPunkt (Markus)]

I was stumbiling over this solution while trying to decode a datapacket from a Lora-Node.

Unfortunately this today does not work (anymore?)

I get this errormessage:
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb3 in position 0: invalid start byte

[123 (Taras)]

Perhaps the problem might be that the supplied string isn’t encoded correctly.

Because decoding works with an encoded string.

[paulusbrand (Paul Brand)]

The problem is that LoraWAN networks send raw byte payloads base64 encoded. So these can not be decoded into utf-8 character strings.

Keep an eye on Base64 decode encoding by paulusbrand · Pull Request #116603 · home-assistant/core · GitHub.

This pull request will enable the option to decode the base64 string into raw bytes, example: