MDBT42 http module using sim808

With the sim900 module the result is OK!

Serial2.setup(9600, { tx: 16, rx: 17 });

var gprs = require('SIM900').connect(Serial2, undefined, function (err) {
  if (err) throw err;
  gprs.connect('APN', 'USER', 'PASSWORD', function (err) {
    if (err) throw err;
    gprs.getIP(function (err, ip) {
      if (err) throw err;
      console.log(ip);
    });
  });
});

After sending the above code I use RELP and get the result below:

>gprs.at.cmd("AT\r\n")
["AT\r\n"
=undefined
] "\r\nOK\r\n"
>

I would like to know using the sim900 module how do I check if the connection is ok with the APN network and how do I reconnect after disconnection.

Ex:

while(!gprs.networkConnect){
gprs.reconnect()
}

How do I do this with the sim900 module? Sorry if the question is stupid!