A system, comprising: a process data consumer (102, 104); a key server; a plurality of gateway nodes (106, 108, 110, 112, 114) configured to communicate with the process data consumer; a plurality of intermediate nodes (116, 118, 120) configured to communicate wirelessly with the gateway nodes; and a plurality of leaf nodes (122, 124, 126, 128, 130) configured to communicate wirelessly with the intermediate nodes and the gateway nodes, wherein: the process data consumer (102, 104) is configured to send a subscription message to at least one of first and second gateway nodes of the plurality of gateway nodes (106, 108, 110, 112, 114), wherein the subscription message identifies a leaf node of the plurality of leaf nodes (122, 124, 126, 128, 130), requests information supplied by the identified leaf node, and requests that the information be published at a first rate; the identified leaf node is configured to: load a security key created by the key server; and at a second rate, repeatedly encrypt leaf node information using the security key and send a wireless message to the first and second gateway nodes via first and second intermediate nodes of the plurality of intermediate nodes, respectively, wherein the wireless message comprises the encrypted leaf node information; and the first and second gateway nodes are configured to: receive the wireless messages sent by the leaf node at the second rate; decrypt the encrypted leaf node information using the key server; and send the decrypted leaf node information to the process data consumer (102, 104) at the first rate. a process data consumer (102, 104); a key server; a plurality of gateway nodes (106, 108, 110, 112, 114) configured to communicate with the process data consumer; a plurality of intermediate nodes (116, 118, 120) configured to communicate wirelessly with the gateway nodes; and a plurality of leaf nodes (122, 124, 126, 128, 130) configured to communicate wirelessly with the intermediate nodes and the gateway nodes, the process data consumer (102, 104) is configured to send a subscription message to at least one of first and second gateway nodes of the plurality of gateway nodes (106, 108, 110, 112, 114), wherein the subscription message identifies a leaf node of the plurality of leaf nodes (122, 124, 126, 128, 130), requests information supplied by the identified leaf node, and requests that the information be published at a first rate; the identified leaf node is configured to: load a security key created by the key server; and at a second rate, repeatedly encrypt leaf node information using the security key and send a wireless message to the first and second gateway nodes via first and second intermediate nodes of the plurality of intermediate nodes, respectively, wherein the wireless message comprises the encrypted leaf node information; and load a security key created by the key server; and at a second rate, repeatedly encrypt leaf node information using the security key and send a wireless message to the first and second gateway nodes via first and second intermediate nodes of the plurality of intermediate nodes, respectively, wherein the wireless message comprises the encrypted leaf node information; and the first and second gateway nodes are configured to: receive the wireless messages sent by the leaf node at the second rate; decrypt the encrypted leaf node information using the key server; and send the decrypted leaf node information to the process data consumer (102, 104) at the first rate. receive the wireless messages sent by the leaf node at the second rate; decrypt the encrypted leaf node information using the key server; and send the decrypted leaf node information to the process data consumer (102, 104) at the first rate.