Schedules require separate settings for APN
credentials. General settings for APN have no meaning
while schedule is executed. Various SIM cards can work
within separate APNs, e.g. separate settings for private
billing system and FTP in public network.
APN must be always programmed correctly. Without
APN settings schedule will not work, or work wrong.
Demand to synchronize the time with NTP server.
Address of NTP must be working inside the
programmed in previous step APN. Can be turned off if
NTP is not used.