How to get Client IP from UDP Transport in Mule ESB?

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I'm trying to get the client IP and socket of a UDP package and save it in a Flowvar variable using the MEL code

#[message.inboundProperties.MULE_REMOTE_CLIENT_ADDRESS]

However this variable is always null, I have been able to make it work on TCP transport, does anyone know how to get the remote client address in UDP?

This is my XML file:

<mule xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata"  xmlns:udp="http://www.mulesoft.org/schema/mule/udp" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/udp http://www.mulesoft.org/schema/mule/udp/current/mule-udp.xsd
http://www.mulesoft.org/schema/mule/amqp http://www.mulesoft.org/schema/mule/amqp/current/mule-amqp.xsd">
<udp:connector name="UDP" validateConnections="true" keepSendSocketOpen="true" doc:name="UDP" broadcast="true"/>
<flow name="udpFlow">
<udp:inbound-endpoint exchange-pattern="one-way" host="172.22.20.103" port="4040" connector-ref="UDP" responseTimeout="10000" doc:name="UDP" metadata:id="9260547c-3b58-4ebd-953e-fd3e7bb063f3"/>
<object-to-string-transformer doc:name="Object to String"/>
<set-variable variableName="source" value="#[message.inboundProperties.MULE_REMOTE_CLIENT_ADDRESS]" metadata:id="6a72ad72-167f-44da-9f3d-75143c5c0a2f" doc:name="Variable"/>
<set-payload value="#[flowVars.source] dice #[payload]" doc:name="Set Payload"/>
<echo-component doc:name="Echo"/>
</flow>
</mule>

UPDATE: I solve the Address issue with the MEL code

#[message.inboundProperties['packet.address']]: #[message.inboundProperties['packet.port']]

Thanks to David Dossot for his help.

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David Dossot On

Use:

#[message.inboundProperties['packet.address']]