connect method
void
connect()
Implementation
void connect(
String address,
void Function(String) onConnected,
void Function() onDisconnected,
void Function() onConnectionError) {
_connectCbMap[address] = onConnected;
_disconnectCbMap[address] = onDisconnected;
_connectErrorCbMap[address] = onConnectionError;
_channel.invokeMethod('connect', {"address": address});
}