This is not confirmed, but it might work.
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Install MQTT Broker/Client adapter
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Configure and start MQTT adapter
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Add to /etc/wmbusmeters.conf
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shell=/usr/bin/mosquitto_pub -h localhost -t wmbusmeters/$METER_ID -m "$METER_TOTAL_M3"
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When wmbusmeters sends data, check under Objects -> mqtt.0/wmbusmeters/[meter_id] and you should see value reported