@alexeinz figured it out, apparently had to add experimental and get latest mosquitto for the conf file to work correctly , now the bridge is working perfectly :+1:
--- broker.conf file in /etc/mosquitto/conf.d
the topics coming from gw will appear under sensor/# on mosquitto
connection MMQTTtoSensor
address 192.168.1.234 <-gw ip
clientid MyMQTT
cleansession true
notifications true
topic # in 2 sensor/ MyMQTT/