templates.yaml

# OpenWebRX additional template sensors based on attributes
# All depend on Ping sensor 'binary_sensor.openwebrx' to check connection
# of the WebSDR.

# Time elapsed since last FT8 decode in minutes
# Derived from sensor mqtt sensor 'sensor.openwebrx_ft8'
- sensor:
  - name: webrx-ft8-min_ago
    device_class: duration
    unit_of_measurement: "min"
    state: >
      {% set te = (( as_timestamp(now()) 
      - state_attr( 'sensor.openwebrx_ft8', 'timestamp')/1000 )/ 60) | round(1) %}
      {% if te is defined and te >= 0 %}{{ te }}{% else %}0{% endif %}
    availability: "{{ is_state('binary_sensor.openwebrx','on') }}"     
    icon: mdi:clock

# Shows the connected SDRs and types 
# derived from rest sensor 'sensor.openwebrx_version'
- sensor:
  - name: sdr_connected
    state: >
     {{ state_attr( 'sensor.openwebrx_version', 'sdrs') | count }}
    availability: "{{ is_state('binary_sensor.openwebrx','on') }}"
    icon: mdi:signal-variant
    attributes:
      sdr: >
        [{% for j in state_attr( 'sensor.openwebrx_version', 'sdrs') %}
        '{{ j.name }}',
        {% endfor %}]