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How to transmit Kaku messages from Sonoff RFbridge + Pilight

Hi all,
End of last year I installed 2 SRFB’s with Pilight installed on them. The SRFB’s have the hardware hack https://github.com/xoseperez/espurna/wiki/Hardware-Itead-Sonoff-RF-Bridge—Direct-Hack and together they have good coverage of the RF433 devices in our house and receive the messages on the MQTT server. Now I would like to transmit RF433 messages to ring the doorbell. I do get the JSON message on the MQTT server, however, I don’t what the correct message format is.
Using the old button the SRFB-Pilight receives:

{“message”:
{“id”:8830454,“unit”:3,“state”:“on”},
“protocol”:“arctech_switch”,“length”:8830454,“value”:8830454,“repeats”:2,“status”:2
}

I’ve tried that same message and nothing happens. I also tried

{“message”:
{“id”:8830454,“unit”:3,“on”:1},
“protocol”:“arctech_switch”,“length”:8830454,“value”:8830454,“repeats”:2,“status”:2
}

and

{“message”:
{“id”:8830454,“unit”:3,“on”:1},
“protocol”:“kaku_switch”,“length”:8830454,“value”:8830454,“repeats”:2,“status”:2
}

and many other combinations, but thusfar no sound from the doorbell. Anybody out there who knows what the correct message format is?