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Messages can be sent to collection members by using the return value of the members() function to loop through members with a foreach and send an event to each Tx.

They can also be sent by raising the wrangler:send_event_to_collection_members API event. It internally uses the Rx_role of the collection pico in the subscription so be wary of collisions. 

rule sendEventToNodes {
  select when test test
  always {
    raise wrangler event "send_event_to_collection_members" attributes {
      "domain":"wrangler",
      "type":"child_creation",
      "attrs":{
        "name":"CreatedBySubscription"
      }
    }
  }
}