Error: UPDATE devices SET temp_min= '', temp_max ='', adjust_temp='' ,
        hum_min='', hum_max ='', adjust_hum ='',
        dev_ip ='', decv_gatway ='', dev_subnet ='',
        max_probe='' , doors ='' , createby=''  
        WHERE dev_sn=''<br>Unknown column 'dev_sn' in 'where clause'