A system comprising: an edge router, comprising: a transmitter circuitry configured to transmit data on a plurality of M frequency hopped channels; and a multichannel receiver circuitry (50,52,54,56,58) configured to: receive a plurality of packets on a plurality of L independent frequencies (40,42,44,48) transmitted by a plurality of nodes (14,16,18,20,22,24,38), wherein the plurality nodes are configured in a plurality of network layers (15, 17, 19, 21, 23, 25) including a first network layer comprising a first plurality of nodes and a second network layer comprising a second plurality of nodes, wherein the first plurality of nodes is configured to communicate directly with the edge router and with the second plurality of nodes and wherein the second plurality of nodes is configured to communicate with the edge router via the first plurality of nodes; simultaneously receive, from a first node of the plurality of nodes (14, 16), a first packet on a first frequency of the plurality of independent frequencies and receive, from at least one second node (14, 16) of the plurality of nodes, the first packet on a frequency of the plurality of independent frequencies that is different to the first frequency, wherein the first and at least one second nodes are in the first network layer and wherein the multichannel receiver circuitry is configured to receive each first packet a plurality of times without using an acknowledgement packet; and wherein the edge router is configured to discard one or more received copies of the first packet and transmit a single copy of the first packet. a transmitter circuitry configured to transmit data on a plurality of M frequency hopped channels; and a multichannel receiver circuitry (50,52,54,56,58) configured to: receive a plurality of packets on a plurality of L independent frequencies (40,42,44,48) transmitted by a plurality of nodes (14,16,18,20,22,24,38), wherein the plurality nodes are configured in a plurality of network layers (15, 17, 19, 21, 23, 25) including a first network layer comprising a first plurality of nodes and a second network layer comprising a second plurality of nodes, wherein the first plurality of nodes is configured to communicate directly with the edge router and with the second plurality of nodes and wherein the second plurality of nodes is configured to communicate with the edge router via the first plurality of nodes; simultaneously receive, from a first node of the plurality of nodes (14, 16), a first packet on a first frequency of the plurality of independent frequencies and receive, from at least one second node (14, 16) of the plurality of nodes, the first packet on a frequency of the plurality of independent frequencies that is different to the first frequency, wherein the first and at least one second nodes are in the first network layer and wherein the multichannel receiver circuitry is configured to receive each first packet a plurality of times without using an acknowledgement packet; and receive a plurality of packets on a plurality of L independent frequencies (40,42,44,48) transmitted by a plurality of nodes (14,16,18,20,22,24,38), wherein the plurality nodes are configured in a plurality of network layers (15, 17, 19, 21, 23, 25) including a first network layer comprising a first plurality of nodes and a second network layer comprising a second plurality of nodes, wherein the first plurality of nodes is configured to communicate directly with the edge router and with the second plurality of nodes and wherein the second plurality of nodes is configured to communicate with the edge router via the first plurality of nodes; simultaneously receive, from a first node of the plurality of nodes (14, 16), a first packet on a first frequency of the plurality of independent frequencies and receive, from at least one second node (14, 16) of the plurality of nodes, the first packet on a frequency of the plurality of independent frequencies that is different to the first frequency, wherein the first and at least one second nodes are in the first network layer and wherein the multichannel receiver circuitry is configured to receive each first packet a plurality of times without using an acknowledgement packet; and wherein the edge router is configured to discard one or more received copies of the first packet and transmit a single copy of the first packet.