Implement Ethernet interface for Nanostack.

* New Phy type: NanostackEthernetPhy
* New tasklet: enet_tasklet.
* New Interface: NanostackEthernetInterface,
  inherited from MeshInterfaceNanostack

Author: Seppo Takalo

features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/mbed-mesh-api/NanostackEthernetInterface.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2016 ARM Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef NANOSTACKETHERNETINTERFACE_H
+#define NANOSTACKETHERNETINTERFACE_H
+
+#include "MeshInterfaceNanostack.h"
+#include "NanostackEthernetPhy.h"
+
+class NanostackEthernetInterface : public MeshInterfaceNanostack {
+public:
+
+    NanostackEthernetInterface() : MeshInterfaceNanostack() { }
+    NanostackEthernetInterface(NanostackEthernetPhy *phy) : MeshInterfaceNanostack(phy) { }
+
+    nsapi_error_t initialize(NanostackEthernetPhy *phy);
+    int connect();
+    int disconnect();
+    bool getOwnIpAddress(char *address, int8_t len);
+    bool getRouterIpAddress(char *address, int8_t len);
+};
+
+#endif // NANOSTACKETHERNETINTERFACE_H

features/nanostack/FEATURE_NANOSTACK/mbed-mesh-api/source/NanostackEthernetInterface.cpp

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2016 ARM Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "NanostackEthernetInterface.h"
+#include "mesh_system.h"
+#include "callback_handler.h"
+#include "enet_tasklet.h"
+
+nsapi_error_t NanostackEthernetInterface::initialize(NanostackEthernetPhy *phy)
+{
+    nsapi_error_t err = MeshInterfaceNanostack::initialize(phy);
+    if (err != NSAPI_ERROR_OK)
+        return err;
+
+    nanostack_lock();
+
+    if (register_phy() < 0) {
+        nanostack_unlock();
+        return NSAPI_ERROR_DEVICE_ERROR;
+    }
+
+    enet_tasklet_init();
+    __mesh_handler_set_callback(this);
+    _network_interface_id = enet_tasklet_network_init(_device_id);
+
+    nanostack_unlock();
+
+    if (_network_interface_id < 0)
+        return MESH_ERROR_UNKNOWN;
+    else
+        return MESH_ERROR_NONE;
+}
+
+int NanostackEthernetInterface::connect()
+{
+    nanostack_lock();
+    int8_t status = enet_tasklet_connect(&__mesh_handler_c_callback, _network_interface_id);
+    nanostack_unlock();
+
+    if (status == -1) {
+        return MESH_ERROR_PARAM;
+    } else if (status == -2) {
+        return MESH_ERROR_MEMORY;
+    } else if (status == -3) {
+        return MESH_ERROR_STATE;
+    } else if (status != 0) {
+        return MESH_ERROR_UNKNOWN;
+    }
+
+    int32_t count = connect_semaphore.wait(30000);
+
+    if (count <= 0) {
+        return NSAPI_ERROR_DHCP_FAILURE; // sort of...
+    }
+    return 0;
+}
+
+int NanostackEthernetInterface::disconnect()
+{
+    enet_tasklet_disconnect();
+    return 0;
+}
+
+bool NanostackEthernetInterface::getOwnIpAddress(char *address, int8_t len)
+{
+    return enet_tasklet_get_ip_address(address, len)?false:true;
+}
+
+bool NanostackEthernetInterface::getRouterIpAddress(char *address, int8_t len)
+{
+    return false;
+}