Fix *MeshInterface::get_default_instance()

This was returning object, instead of pointer.
Also it was trying to call lowpan(reference), instad of lowpan(ptr).

Author: Seppo Takalo

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

@@ -165,8 +165,8 @@ bool LoWPANNDInterface::getRouterIpAddress(char *address, int8_t len)
 #if MBED_CONF_NSAPI_DEFAULT_MESH_TYPE == LOWPAN && DEVICE_802_15_4_PHY
 MBED_WEAK MeshInterface *MeshInterface::get_default_instance()
 {
-    static LoWPANNDInterface lowpan(NanostackRfPhy::get_default_instance());
+    static LoWPANNDInterface lowpan(&NanostackRfPhy::get_default_instance());
 
-    return lowpan;
+    return &lowpan;
 }
 #endif

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

@@ -255,8 +255,8 @@ mesh_error_t Nanostack::ThreadInterface::device_pskd_set(const char *pskd)
 #if MBED_CONF_NSAPI_DEFAULT_MESH_TYPE == THREAD && DEVICE_802_15_4_PHY
 MBED_WEAK MeshInterface *MeshInterface::get_target_default_instance()
 {
-    static ThreadInterface thread(NanostackRfPhy::get_default_instance());
+    static ThreadInterface thread(&NanostackRfPhy::get_default_instance());
 
-    return thread;
+    return &thread;
 }
 #endif

features/netsocket/mbed_lib.json

@@ -9,7 +9,10 @@
         "default-cellular-apn": null,
         "default-cellular-username": null,
         "default-cellular-password": null,
-        "default-mesh-type": "THREAD",
+        "default-mesh-type": {
+            "help": "Configuration type for MeshInterface::get_default_instance(). [LOWPAN/THREAD]",
+            "value": "THREAD"
+        },
         "dns-response-wait-time": {
             "help": "How long the DNS translator waits for a reply from a server in milliseconds",
             "value": 5000