Data processing method and system

A method of managing routing in a wireless network, the method comprising:

• receiving a message from a descendant node via a routing node;
• determining whether routing information indicates a route to the descendant node via the routing node;
• if the routing information does not indicate the route, adding information to the routing information indicating the route to the descendant node via the routing node;
• and
• forwarding the message to a destination node.

A system comprising a plurality of nodes arranged in a wireless network, the plurality of nodes including at least a first router node, the first router node arranged to:

• receive an indication that a route to a destination node via a second routing node is invalid;
• delete, from a routing table, a first entry indicating the route to the destination node via the second routing node if the indication is received from the second routing node;
• receive a message from a source node via a third descendant routing node;
• determine whether the routing table includes a second entry indicating a route to the source node via the third routing node;
• if the routing information does not include the second entry, add the second entry to the routing table indicating the route to the source node via the third routing node;
• and
• forward the message to a parent node of the first routing node.