It cost me several days to figure out the correct commands to send a three digit channel number to the Harmony Hub. Finally found it and want to share…
In <Developer Tools> + <Services>:
<Domain> is <remote>
<Service> is <send_command>
<Service Data JSon optional> is {“entity_id”:“remote.harmony”,“device”: “19977378”,“command”: [“6”, “6”, “4”]}
Push <Call Service>-button on page.
short question why your are doing it that complicated? Simply define the Channels on you hub by name! Update your harmony conf and look for the code for your channels in harmony.conf. Create an Input Select with your TV Channels names. And create an automation. In the End it Looks like this.
And another benefit is that you can select your TV channels by asking Alexa or Google home to set the TV Channel to BBC in Harmony Hub. Without remembering the numbers