dynamic loading of network stack no longer needed

ext/picotcp/modules/pico_dev_null.c

@@ -0,0 +1,60 @@
+/*********************************************************************
+   PicoTCP. Copyright (c) 2012-2015 Altran Intelligent Systems. Some rights reserved.
+   See LICENSE and COPYING for usage.
+
+   Authors: Daniele Lacamera
+ *********************************************************************/
+
+
+#include "pico_device.h"
+#include "pico_dev_null.h"
+#include "pico_stack.h"
+
+struct pico_device_null {
+    struct pico_device dev;
+    int statistics_frames_out;
+};
+
+#define NULL_MTU 0
+
+static int pico_null_send(struct pico_device *dev, void *buf, int len)
+{
+    struct pico_device_null *null = (struct pico_device_null *) dev;
+    IGNORE_PARAMETER(buf);
+
+    /* Increase the statistic count */
+    null->statistics_frames_out++;
+
+    /* Discard the frame content silently. */
+    return len;
+}
+
+static int pico_null_poll(struct pico_device *dev, int loop_score)
+{
+    /* We never have packet to receive, no score is used. */
+    IGNORE_PARAMETER(dev);
+    return loop_score;
+}
+
+/* Public interface: create/destroy. */
+
+
+struct pico_device *pico_null_create(char *name)
+{
+    struct pico_device_null *null = PICO_ZALLOC(sizeof(struct pico_device_null));
+
+    if (!null)
+        return NULL;
+
+    if( 0 != pico_device_init((struct pico_device *)null, name, NULL)) {
+        return NULL;
+    }
+
+    null->dev.overhead = 0;
+    null->statistics_frames_out = 0;
+    null->dev.send = pico_null_send;
+    null->dev.poll = pico_null_poll;
+    dbg("Device %s created.\n", null->dev.name);
+    return (struct pico_device *)null;
+}
+