Dsmr_reader and mosquitto broker

Hi, I have a raspberry Pi3 with home assistant installed. Via Portainer, I have also installed the dsmr_reader docker container, which is starting up fine and can be reached on its :7777 address. Now the next question, how to get the MQTT messages to home assistant?

I have setup dsmr_reader as per this site: https://www.home-assistant.io/integrations/dsmr_reader/, and using MQTT explorer i can send messages from my pc to the mosquito broker.

I dont receive the messages from DSMR_reader however, and I am wondering which hassio address i should use in dsmr_reader. Should i use the internal portainer ip, or the ip of the raspberry pi itself? If i need to use the internal portainer ip, should it be the one from hassio of the mosquitto container?

I have a similar setup as you described and also do not understand why the two ends do not communicate.
I wonder has this already been resolved?