Actually, the spec includes a low power node specifically to address this issue. For low power nodes, there is no obligation to re-transmit messages and participate in the mesh network at that level. Low power nodes only need to react and send messages specific to the node. So the additional code for mesh primarily deals with the node provisioning and handling messages at the higher layers of the spec.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Actually, the spec includes a low power node specifically to address this issue. For low power nodes, there is no obligation to re-transmit messages and participate in the mesh network at that level. Low power nodes only need to react and send messages specific to the node. So the additional code for mesh primarily deals with the node provisioning and handling messages at the higher layers of the spec.