public function wifi($sType, $sSsid, $sPwd)
    {
        $this->sData .= 'WIFI:T:' . $sType . ';S' . $sSsid . ';' . $sPwd . "\n";
        return $this;
    }
public function wifi($sType, $sSsid, $sPwd)
    {
        $this->sData .= 'WIFI:T:' . $sType . ';S' . $sSsid . ';' . $sPwd . "\n";
        return $this;
    }
@param string $sType
@param string $sSsid
@param string $sPwd

@return self