openwrt connection with random mac

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uci set wireless.radio1.country='US'
uci set wireless.radio1.txpower='30'
uci set wireless.radio1.htmode='HT20'
uci set wireless.radio1.channel='auto'
uci set wireless.@wifi-iface[1]=wifi-iface
uci set wireless.@wifi-iface[1].ssid='..............'
uci set wireless.@wifi-iface[1].encryption='psk'
uci set wireless.@wifi-iface[1].device='radio1'
uci set wireless.@wifi-iface[1].mode='sta'
uci set wireless.@wifi-iface[1].key='H3EUA3DkNPaCcEe4NMtM'
uci set wireless.@wifi-iface[1].bssid='................'

ifdown wwanUSB

  OLDMAC=$(uci get network.wwanUSB.macaddr)
  echo ${OLDMAC}
  while true; do                                                                                                                              
                                                                                                                                            
        NEWMAC=$(dd if=/dev/urandom bs=1024 count=1 2>/dev/null | md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\)\(..\).*$/\1:\2:\3:\4:\5:\6/')
        
        foo=$((0x${NEWMAC:0:2}))
        # Comprueba que el primer byte de la MAC sea par, si no lo es repite hasta que lo sea 
                if [ $((foo%2)) -eq 0 ];                                                                                                 
                        then                                                                                                             
                        echo "par";                                                                                                      
                        break                                                                                                            
                else                                                                                                                   
                echo "impar";                                                                                                          
                fi                                                                                                                     
done  

  echo ${NEWMAC}
  uci set wireless.@wifi-iface[1].macaddr=${NEWMAC}
  uci set network.wwanUSB.macaddr=${NEWMAC}

uci commit wireless
ifup wwanUSB