Decode base64 image

Configuration
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1

I searched in the community and googled but I can’t find a way to decode a base64 image from a MQTT payload and saving it as file.

Is it possible?

1 Like
2

Yes, it’s possible. AFAICT it is the execution of a command using the command_line platform where the command is constructed from a template and the executed using the actual eval command, e.g.

- platform: template
  sensors:
    intranet_iperf_command:
      value_template: >-
        {%- set s = states('input_text.intranet_iperf_host') -%}
        {%- if s is none or s|lower == 'unknown' -%}
          {%- set s = states('input_text.motion_mqtt_broker') -%}
          {%- if s is none or s|lower == 'unknown' or s|lower == 'null' -%}
            {%- set s = '127.0.0.1' -%}
          {%- endif -%}
        {%- endif -%}
        iperf3 -i 0 -t 1 -J -c {{ s }} | jq '{"host":"{{- s -}}","date":.start.timestamp.timesecs,"send":.end.sum_sent.bits_per_second,"receive":.end.sum_received.bits_per_second}'

- platform: command_line
  name: intranet_test
  scan_interval: !secret intranet-scan-interval
  command_timeout: 60
  command: "eval {{- states('sensor.intranet_iperf_command') -}}"
  json_attributes:
    - date
    - send
    - receive
  value_template: >
    {%- if value_json is defined -%}True{%- else -%}False{%- endif -%}

This example is for iperf execution, but it should be adaptable to your needs so long as the BASE64 encoded image data can be transferred successfully; that I have not tried.