Correct network status callbacks with Nanostack.

Ethernet-tasklet needs to be registered for emac link state changes.
Ethernet-tasklet will then handle ethernet cable connection/disconnection events.

features/nanostack/mbed-mesh-api/source/NanostackEMACInterface.cpp

@@ -7,6 +7,7 @@
 #include "nsdynmemLIB.h"
 #include "arm_hal_phy.h"
 #include "EMAC.h"
+#include "enet_tasklet.h"
 
 class EMACPhy : public NanostackEthernetPhy {
 public:
@@ -137,6 +138,7 @@ int8_t EMACPhy::phy_register()
 
         emac.set_memory_manager(memory_manager);
         emac.set_link_input_cb(mbed::callback(this, &EMACPhy::emac_phy_rx));
+        emac.set_link_state_cb(enet_tasklet_link_state_changed);
 
         if (!emac.power_up()) {
             return -1;

features/nanostack/mbed-mesh-api/source/ethernet_tasklet.c

@@ -119,6 +119,25 @@ void enet_tasklet_main(arm_event_s *event)
         case APPLICATION_EVENT:
             if (event->event_id == APPL_EVENT_CONNECT) {
                 enet_tasklet_configure_and_connect_to_network();
+            } else if (event->event_id == APPL_BACKHAUL_INTERFACE_PHY_UP) {
+                // Ethernet cable has been plugged in
+                arm_nwk_interface_configure_ipv6_bootstrap_set(
+                    tasklet_data_ptr->network_interface_id, NET_IPV6_BOOTSTRAP_AUTONOMOUS, NULL);
+                enet_tasklet_configure_and_connect_to_network();
+
+                if (tasklet_data_ptr->poll_network_status_timeout != NULL) {
+                    // Restart poll timer
+                    eventOS_timeout_cancel(tasklet_data_ptr->poll_network_status_timeout);
+                }
+                tasklet_data_ptr->poll_network_status_timeout =
+                    eventOS_timeout_every_ms(enet_tasklet_poll_network_status, 2000, NULL);
+            } else if (event->event_id == APPL_BACKHAUL_INTERFACE_PHY_DOWN) {
+                // Ethernet cable has been removed
+                arm_nwk_interface_down(tasklet_data_ptr->network_interface_id);
+                eventOS_timeout_cancel(tasklet_data_ptr->poll_network_status_timeout);
+                tasklet_data_ptr->poll_network_status_timeout = NULL;
+                memset(tasklet_data_ptr->ip, 0x0, 16);
+                enet_tasklet_network_state_changed(MESH_BOOTSTRAP_STARTED);
             }
             break;
 
@@ -300,3 +319,15 @@ int8_t enet_tasklet_network_init(int8_t device_id)
         tasklet_data_ptr->network_interface_id, NET_IPV6_BOOTSTRAP_AUTONOMOUS, NULL);
     return tasklet_data_ptr->network_interface_id;
 }
+
+void enet_tasklet_link_state_changed(bool up)
+{
+    arm_event_s event = {
+        .receiver = tasklet_data_ptr->tasklet,
+        .sender =  tasklet_data_ptr->tasklet,
+        .event_type = APPLICATION_EVENT,
+        .priority = ARM_LIB_LOW_PRIORITY_EVENT,
+        .event_id = up ? APPL_BACKHAUL_INTERFACE_PHY_UP : APPL_BACKHAUL_INTERFACE_PHY_DOWN,
+    };
+    eventOS_event_send(&event);
+}

features/nanostack/mbed-mesh-api/source/include/enet_tasklet.h

@@ -26,6 +26,7 @@ void enet_tasklet_init(void);
 uint8_t enet_tasklet_network_init(int8_t);
 int8_t enet_tasklet_connect(void (*)(mesh_connection_status_t mesh_status), int8_t nwk_interface_id);
 void enet_tasklet_disconnect();
+void enet_tasklet_link_state_changed(bool up);
 
 #ifdef __cplusplus
 }

features/nanostack/mbed-mesh-api/source/include/mesh_system.h

@@ -25,7 +25,11 @@ extern "C" {
 /*
  * Event type for connecting
  */
-#define APPL_EVENT_CONNECT 0x01
+enum {
+    APPL_EVENT_CONNECT = 0x01,
+    APPL_BACKHAUL_INTERFACE_PHY_DOWN,
+    APPL_BACKHAUL_INTERFACE_PHY_UP
+};
 
 /*
  * \brief Send application connect event to receiver tasklet to