ROS communication works only in one direction

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Note that a complicating factor here could be the Docker setup. Docker by default uses NAT (ie: masquerading), so it's not always as straightforward as setting ROS_IP and ROS_MASTER_URI to get things to work.

Does the masqueradidng change the ROS_MASTER_URI ? If not, is it possible to replacePC_IP_ADDRESS for the ROS_MASTER_URI by RASPBERRY_IP_ADDRESS to prevent the issue ?

Docker creates a "virtual network" by default, so depending on where you run your master you'll have to update the ROS_MASTER_URI yes (and most likely the routing configuration of the involved hosts). But the more difficult issue is that NAT will "hide" nodes running inside your container.

@Delb the ROS_HOSTNAME is different across devices, It was not clear from my question.

@gvdhoorn You are right, the error is due to the Docker setup. I'm running the container with the --privileged and --net=host flags. From ifconfig inside Docker, I see the docker and wlan interfaces. I am using the wlan inet address in the exported env variables