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CONFIG SET RTC SOURCE GSM / NTP ntp_adr ntp_port - sets the internal clock sync
source, ntp_adr and ntp_port must be omitted if GSM option is selected
CONFIG GET RTC SOURCE GSM / NTP ntp_adr ntp_port - returns the internal clock
synchronization source
CONFIG SET NETWORK SEARCH MODE 2G/3G/4G/AUTO - sets the network search
mode
CONFIG GET NETWORK SEARCH MODE 2G/3G/4G/AUTO - returns the network search
mode
CONFIG SAVE