An industrial process control system comprising: a plurality of field devices (FD1-FD9) each having a field device address provided according to a control system protocol; a host configured to send control messages to field devices and to receive response messages from the field devices according to the control system protocol; a wireless mesh network 16 for routing wireless messages among a plurality of nodes (20, 22, 24, 26, 28, 30), each node being defined by a wireless address provided according to a wireless protocol and being associated with at least one of the plurality of field devices, wherein the wireless messages include a payload of an embedded control message or response message; characterized by: a gateway configured to receive a control message from the host 12 according to a control system protocol that includes a field device address, wherein the gateway is configured that in response to a control message received from the host the said gateway generates a wireless messages having a wireless address selected from a lookup table based on the address of the selected field device and having a payload that includes an embedded control message, and the embedded control message having the address of a selected field device provided according to the control system protocol; and wherein the wireless message is communicated through the wireless mesh network to the node corresponding to the wireless address of the wireless message, wherein the node is configured to separate the control message from the wireless message and to deliver the control message to the addressed field device according to the control system protocol. a plurality of field devices (FD1-FD9) each having a field device address provided according to a control system protocol; a host configured to send control messages to field devices and to receive response messages from the field devices according to the control system protocol; a wireless mesh network 16 for routing wireless messages among a plurality of nodes (20, 22, 24, 26, 28, 30), each node being defined by a wireless address provided according to a wireless protocol and being associated with at least one of the plurality of field devices, wherein the wireless messages include a payload of an embedded control message or response message; characterized by: a gateway configured to receive a control message from the host 12 according to a control system protocol that includes a field device address, wherein the gateway is configured that in response to a control message received from the host the said gateway generates a wireless messages having a wireless address selected from a lookup table based on the address of the selected field device and having a payload that includes an embedded control message, and the embedded control message having the address of a selected field device provided according to the control system protocol; and wherein the wireless message is communicated through the wireless mesh network to the node corresponding to the wireless address of the wireless message, wherein the node is configured to separate the control message from the wireless message and to deliver the control message to the addressed field device according to the control system protocol. a gateway configured to receive a control message from the host 12 according to a control system protocol that includes a field device address, wherein the gateway is configured that in response to a control message received from the host the said gateway generates a wireless messages having a wireless address selected from a lookup table based on the address of the selected field device and having a payload that includes an embedded control message, and the embedded control message having the address of a selected field device provided according to the control system protocol; and wherein the wireless message is communicated through the wireless mesh network to the node corresponding to the wireless address of the wireless message, wherein the node is configured to separate the control message from the wireless message and to deliver the control message to the addressed field device according to the control system protocol.