AT+CGATT? Back + CGATT: 1 indicates that the attachment is successful, with a delay of about 30s
AT+CEREG? Search for network status, 1 for Internet, 2 for Network
AT+CSCON? Query the connection status, 1 CONNECT, 0 IDLE
Network connectivity status chart
Connect status (+ CSCON: 0, 1, the module is in this state after network injection), the duration of this state is configured by the base station, and and can be controlled by the device between the range of 1-3600 seconds, the default being 20s.
Idle state (+ CSCON: 0,0), this state lasts the time to dispose by the key network, by Active timer (T3324) Come Control, the range of 0-11160s, the default 10s.
PSM state (Judgment by power consumption, the maximum power consumption 5uA), the duration of the state by the core network configuration, set by the TAU Timer (T3412) to control the range of 0h-310h, the default 24h.