Send Denon player info from Home Assistant to Crestron Home system

Configuration
1

I’m looking already for a week to find the correct syntax to use in my HA automation, with regarding to the action part ,to fullfil my variable, which I’ve defined in my rest_command.
The configuration-yaml contains:

rest_command:
  crestron_denon_mediaplayer_post:
    url: "http://192.168.128.209:5001"
    method: post
    payload: '{"data":{"album":"{{w_album }}"}}'
    content_type: "application/json"

The action contains:

action: rest_command.crestron_denon_mediaplayer_post
target:
  entity_id: media_player.denon_dnp_2000ne
data:
  w_album: state_attr.media_station

My version of home assistant:
HA core: 2025.12.0, installed on a Raspberry PI 4, performed via the raspberry image tool.

The message has been sent from HA to Crestron, but the variable has never been populated. It seems HA is not be able to link it with the device. The message has been received in my Crestron without errors.
I’ve no errors found with regarding to this automatisation on the HA logs.

Thanks in advice for your support.

2

Test from Linux PC first.
Then test in HA after confirm command

There is small syntax difference HA vs Linux command line. At least that was my experience.