Change variable within the python module

Hello!

I now want to build a timer to calculate the transmission time of Osmocom Sink and store it in two variables(minutes and seconds), how can I do that? I search the mailing list and find that it is advised to use the message but in this case, I cannot use a message since I just want to change the value of a variable. And next, I need to send the time value to another python module to control whether to transmit it or not at a specific time with a multiply const with variable value set 1 or 0. Again, I cannot use message since the module doesn't have a port for that. How can I achieve both of them? I search the Internet but still couldn't figure out how to achieve that goal. And in the attachment is the grc file.

Best Regards,
Bob