Maybe you can add something like?
replace my object with your groupadress / objectname
Code:
os.sleep(10) --time delay of 10 seconds
grp.write('my object', false)
os.sleep(10) --time delay of 10 seconds
grp.write('my object', false)
os.sleep(10) --time delay of 10 seconds
grp.write('my object', false)
replace my object with your groupadress / objectname