How to handle MsgSecNum (tag 34) while requesting market data

Hello again,

Im looking for a way to menage MsgSecNum (tag 34) while requesting market data in a loop.

Im sending 35=V message and im reciving 35=W response exactly as expected, but it happens only once.

I wish to loop market data reguest every  X miliseconds, and the only problem is tag 34 (it should increase every time it loops i guess). Of course I could add "1" to the prev MsgSecNum every time loop repeats itself, yet I have a feeling that this is not the best way to do it. After a long conection the value of MsgSecNum will be huge.

Should I reset MsgSecNum sometimes, if so then how often?

Maybe I should make a new connection every X loops?

Or maybe there is some smart way to do it?

Thanks in advance,

Wiktor