How to send empty value via radclient?

[Alexander Kubatkin]

Hello,

Need to send empty value in attribute via coa request for clear any
value in current state of attribute and clear attribute itself:

 # /bin/echo "Context-Name = local, Qos-Policing-Profile-Name='' ,
Qos-Metering-Profile-Name='' , Framed-IP-Address = yy.yy.yy.yy" |
/usr/local/bin/radclient -x -t 3 -c 1 -r 2 -p 4 xx.xx.xx.xx:3799 coa xxxxxx
 Sending CoA-Request of id 121 to xx.xx.xx.xx port 3799
         Context-Name = "dhcp"
         Qos-Policing-Profile-Name = ""
         Qos-Metering-Profile-Name = ""
         Framed-IP-Address = yy.yy.yy.yy
 rad_recv: CoA-NAK packet from host xx.xx.xx.xx port 3799, id=121, length=32
         Error-Cause = Missing-Attribute
         Event-Timestamp = "Jun 27 2011 10:48:37 MSD"


Missing-Attribute is because NAS doesn't receive two attributes
Qos-Policing-Profile-Name and Qos-Metering-Profile-Name because
radclient doesn't really send it or filtered it, i.e. NAS only received
Context-Name and Framed-IP-Address, is this possible to send empty value?


-- 
Alexander Kubatkin