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Note: Why reading data fails?
1.
Check if sim card is successfully used(only for Unicom and Mobile card)
2.
Check if serial cable is successfully connected(please use cross serial line)
3.
It needs about 30s to generate network connection(led Net lights on). It cannot read
information of sim card before device boots up.
4.
Check if serial parameter has been successfully set, factory default parameter is 115200,8,N,1