Add docs for enhanced setup

doc/enhanced_setup.dot

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+digraph wifibroadcast {
+    size = "a4";
+    compound=true;
+    splines=ortho;
+
+    subgraph cluster_uav {
+            label = "UAV";
+
+            camera;
+
+            subgraph cluster_pizero {
+                    label = "PI Zero";
+                    color = "blue";
+
+                    raspivid[shape=box];
+                    gstreamer[shape=box];
+
+                    raspivid -> gstreamer[label="pipe", style=dotted];
+            }
+
+            camera -> raspivid[label="CSI bus", style=dotted];
+
+            pixhawk;
+            sik_radio1 [label="3DR radio",];
+
+            subgraph cluster_companion {
+                    label = "NanoPI NEO2";
+                    color = "green";
+
+                    wifibroadcast_tx_1[shape=box];
+                    wifibroadcast_tx_2[shape=box];
+                    mavproxy1[label="mavlink router", shape=box];
+            }
+            wifi_tx;
+            ant_tx;
+
+            wifi_tx -> ant_tx;
+
+            gstreamer -> wifibroadcast_tx_1[label="USB", ltail=cluster_pizero, lhead=cluster_companion];
+            pixhawk -> mavproxy1[label="UART"];
+            gstreamer -> wifibroadcast_tx_1[label="UDP 5060", style=dotted];
+            mavproxy1 -> wifibroadcast_tx_2[label="UDP 14550", style=dotted];
+            mavproxy1 -> sik_radio1[label="UART"];
+            wifibroadcast_tx_1 -> wifi_tx [label="radio_port 1", style=dotted];
+            wifibroadcast_tx_2 -> wifi_tx [label="radio_port 2", style=dotted];
+            wifibroadcast_tx_2 -> wifi_tx [label="USB", ltail=cluster_companion];
+    }
+
+    subgraph cluster_GS {
+            label = "Ground station";
+
+            ant_1_1;
+            ant_1_2;
+            ant_2_1;
+            ant_2_2;
+            ant_3_1;
+            ant_3_2;
+
+            wifi_rx1;
+            wifi_rx2;
+            wifi_rx3;
+
+            ant_1_1 -> wifi_rx1;
+            ant_1_2 -> wifi_rx1;
+
+            ant_2_1 -> wifi_rx2;
+            ant_2_2 -> wifi_rx2;
+
+            ant_3_1 -> wifi_rx3;
+            ant_3_2 -> wifi_rx3;
+
+            subgraph cluster_rx1{
+                    label = "Host RX1";
+                    color="red";                    
+                    eth_rx1[label="eth0"];
+                    wifibroadcast_rx_1_1[shape=box];
+                    wifibroadcast_rx_1_2[shape=box];
+            }
+            subgraph cluster_rx2{
+                    label = "Host RX2";
+                    color="red";                    
+                    eth_rx2[label="eth0"];
+                    wifibroadcast_rx_2_1[shape=box];
+                    wifibroadcast_rx_2_2[shape=box];
+            }
+            subgraph cluster_rx3{
+                    label = "Host RX3";
+                    color="red";                    
+                    eth_rx3[label="eth0"];
+                    wifibroadcast_rx_3_1[shape=box];
+                    wifibroadcast_rx_3_2[shape=box];
+            }
+            sik_radio2[label="3DR radio"];
+            subgraph cluster_rx4{
+                    label = "Host RX4";
+                    color="red";                    
+                    eth_rx4[label="eth0"];
+                    mavproxy2[label="mavlink router", shape=box];
+            }
+            wifi_rx1 -> wifibroadcast_rx_1_1[label="radio port 1",style=dotted];
+            wifi_rx1 -> wifibroadcast_rx_1_2[label="radio port 2",style=dotted];
+            wifi_rx2 -> wifibroadcast_rx_2_1[label="radio port 1",style=dotted];
+            wifi_rx2 -> wifibroadcast_rx_2_2[label="radio port 2",style=dotted];
+            wifi_rx3 -> wifibroadcast_rx_3_1[label="radio port 1",style=dotted];
+            wifi_rx3 -> wifibroadcast_rx_3_2[label="radio port 2",style=dotted];
+            sik_radio2 -> mavproxy2;
+            subgraph cluster_laptop {
+                    label = "Linux laptop";
+                    color="green";                    
+                    eth_linux[label="eth0"];
+                    wifibroadcast_agg1[shape=box];
+                    wifibroadcast_agg2[shape=box];
+                    qgroundcontrol[shape=box];
+            }
+            wifibroadcast_rx_1_1 -> wifibroadcast_agg1[label="UDP 5601", style=dotted];
+            wifibroadcast_rx_1_2 -> wifibroadcast_agg2[label="UDP 14551", style=dotted];
+            wifibroadcast_rx_2_1 -> wifibroadcast_agg1[label="UDP 5601", style=dotted];
+            wifibroadcast_rx_2_2 -> wifibroadcast_agg2[label="UDP 14551",style=dotted];
+            wifibroadcast_rx_3_1 -> wifibroadcast_agg1[label="UDP 5601" style=dotted];
+            wifibroadcast_rx_3_2 -> wifibroadcast_agg2[label="UDP 14551",style=dotted];
+
+            ethernet_switch[label="switch"];
+            eth_rx1 -> ethernet_switch[dir=both];
+            eth_rx2 -> ethernet_switch[dir=both];
+            eth_rx3 -> ethernet_switch[dir=both];
+            eth_rx4 -> ethernet_switch[dir=both];
+            eth_linux -> ethernet_switch[dir=both];
+
+            subgraph cluster_video_goggles{
+                    label = "FPV goggles"
+                    style=dotted;
+            subgraph cluster_fpv_pi_zero{
+                    label = "PI Zero";
+                    color="blue";
+                    style=solid;
+                    wifibroadcast_osd[shape=box];
+                    gstreamer_fpv[shape=box];
+
+            }
+            video_display[label="Display"];
+            }
+            wifibroadcast_agg1 -> gstreamer_fpv[label="UDP 5600", style=dotted];
+            wifibroadcast_agg2 -> wifibroadcast_osd[label="UDP 14550", style=dotted];
+            wifibroadcast_agg2 -> wifibroadcast_osd[label="USB", ltail=cluster_laptop, lhead=cluster_fpv_pi_zero];
+            mavproxy2 -> qgroundcontrol[style=dotted];
+            wifibroadcast_osd -> video_display[label="HDMI or AV",ltail=cluster_fpv_pi_zero];
+
+
+    }
+}