How can I send to channel?
This is the code I use for notes:
curl -k https://api.pushbullet.com/v2/pushes -X POST -u <MYTOKEN>: --header "Content-Type: application/json" --data-binary "{\"type\": \"note\", \"title\":\"Note Title\", \"body\": \"Note Body\"}"
You can set the "channel_tag" parameter in the body of the message there: https://docs.pushbullet.com/#create-push