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Sorry for jumping this again but I must update that I've found the answer.

Apparently my /etc/hosts was NOT configured correctly, and the hostname of the remote pc (Raspberry) was incorrect, but the master hostname was correct. In case anyone wonders, such a state make all the topics appear on list, but only the slave (with correct master hostname in /hosts file) could get data from the master, while the master (with wrong slave hostname on /hosts file) did not get anything back (it was my mistake also to think that only the tfs did not pass through).

I do not know what sparked the change, for I did not edit this file for a long time. I thank everyone on this forum for helping out again and again, even if sometimes things fall through. Keep doing an awesome job. Steve

Sorry for jumping this again but I must update that I've found the answer.

Apparently my /etc/hosts was NOT configured correctly, and the hostname of the remote pc (Raspberry) was incorrect, but the master hostname was correct. correct.

In case anyone wonders, such a state make makes all the topics appear on list, but only the slave (with correct master hostname in /hosts file) could get data from the master, while the master (with wrong slave hostname on /hosts file) did not get anything back (it was my mistake also to think that only the tfs did not pass through).

I do not know what sparked the change, for I did not edit this file for a long time. I thank everyone on this forum for helping out again and again, even if sometimes things fall through. Keep doing an awesome job. Steve