I insert delay(3000) in loop to prevent overcharge and issue of offline.
After 12 hour test it's already connected but there is another issue.
I have trigger that send a SMS and a email if arduino go off-line , i received in there last 12 hour over 60 sms and email. One one every about 30 minutes. However until now arduino return on-line after few second.
Since the modify of insert delay in loop I received a sms every five/six hour that I thought it was normal, because the XDSL line can have the down moments.
I continue the test for other 24 hour......I hope so