How to make my OSCdef ignoring the command + period?

I am wondering how to make my OSCdef (also the effect Synth that is running) ignoring the command + period. Thank you in advance!

See the CmdPeriod help file, method remove

n = NetAddr("", 57120); 

o = OSCdef(\test, {|msg, time, addr, recvPort| \unmatching.postln}, '/chat', n); 


m = NetAddr("", 57120); 

m.sendMsg("/chat", "Hello App 1");

Thank you very much! And I find the permanent_(true) method also works.

Yes, permanent_(true) is definitely what you should try first.