Added an AJAX-style web server app that continously updates a web page with data from the Tmote Sky on-board sensors

examples/sky-ip/ajax-cgi.c

@@ -0,0 +1,230 @@
+/*
+ * Copyright (c) 2001, Adam Dunkels.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This file is part of the uIP TCP/IP stack.
+ *
+ * $Id: ajax-cgi.c,v 1.1 2008/07/07 23:42:32 adamdunkels Exp $
+ *
+ */
+
+/*
+ * This file includes functions that are called by the web server
+ * scripts. The functions takes no argument, and the return value is
+ * interpreted as follows. A zero means that the function did not
+ * complete and should be invoked for the next packet as well. A
+ * non-zero value indicates that the function has completed and that
+ * the web server should move along to the next script line.
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "contiki-net.h"
+#include "httpd.h"
+#include "httpd-cgi.h"
+#include "httpd-fs.h"
+
+#include "lib/petsciiconv.h"
+
+static struct httpd_cgi_call *calls = NULL;
+
+/*---------------------------------------------------------------------------*/
+static
+PT_THREAD(nullfunction(struct httpd_state *s, char *ptr))
+{
+  PSOCK_BEGIN(&s->sout);
+  PSOCK_END(&s->sout);
+}
+/*---------------------------------------------------------------------------*/
+httpd_cgifunction
+httpd_cgi(char *name)
+{
+  struct httpd_cgi_call *f;
+
+  /* Find the matching name in the table, return the function. */
+  for(f = calls; f != NULL; f = f->next) {
+    if(strncmp(f->name, name, strlen(f->name)) == 0) {
+      return f->function;
+    }
+  }
+  return nullfunction;
+}
+/*---------------------------------------------------------------------------*/
+static
+PT_THREAD(nodeidcall(struct httpd_state *s, char *ptr))
+{
+  static char buf[10];
+  PSOCK_BEGIN(&s->sout);
+  snprintf(buf, sizeof(buf), "%d.%d",
+	   rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
+  PSOCK_SEND_STR(&s->sout, buf);
+  PSOCK_END(&s->sout);
+}
+/*---------------------------------------------------------------------------*/
+void
+httpd_cgi_add(struct httpd_cgi_call *c)
+{
+  struct httpd_cgi_call *l;
+
+  c->next = NULL;
+  if(calls == NULL) {
+    calls = c;
+  } else {
+    for(l = calls; l->next != NULL; l = l->next);
+    l->next = c;
+  }
+}
+/*---------------------------------------------------------------------------*/
+#include "dev/sht11.h"
+#include "dev/light.h"
+
+static
+PT_THREAD(sensorscall(struct httpd_state *s, char *ptr))
+{
+  static struct timer t;
+  static int i;
+  static char buf[100];
+  static unsigned long last_cpu, last_lpm, last_listen, last_transmit;
+  
+  PSOCK_BEGIN(&s->sout);
+
+  timer_set(&t, CLOCK_SECOND);
+  i = 0;
+  while(1) {
+    timer_restart(&t);
+    PSOCK_WAIT_UNTIL(&s->sout, timer_expired(&t));
+
+    snprintf(buf, sizeof(buf),
+	     "<script type='text/javascript'>t(%d);h(%d);l1(%d);l2(%d);</script>",
+	     sht11_temp(),
+	     sht11_humidity(),
+	     sensors_light1(),
+	     sensors_light2());
+    PSOCK_SEND_STR(&s->sout, buf);
+
+
+    timer_restart(&t);
+    PSOCK_WAIT_UNTIL(&s->sout, timer_expired(&t));
+    snprintf(buf, sizeof(buf),
+	     "<script type='text/javascript'>p(%lu,%lu,%lu,%lu);i(%d);</script>",
+	     energest_type_time(ENERGEST_TYPE_CPU) - last_cpu,
+	     energest_type_time(ENERGEST_TYPE_LPM) - last_lpm,
+	     energest_type_time(ENERGEST_TYPE_TRANSMIT) - last_transmit,
+	     energest_type_time(ENERGEST_TYPE_LISTEN) - last_listen,
+	     i++);
+    last_cpu = energest_type_time(ENERGEST_TYPE_CPU);
+    last_lpm = energest_type_time(ENERGEST_TYPE_LPM);
+    last_transmit = energest_type_time(ENERGEST_TYPE_TRANSMIT);
+    last_listen = energest_type_time(ENERGEST_TYPE_LISTEN);
+    PSOCK_SEND_STR(&s->sout, buf);
+
+}
+  PSOCK_END(&s->sout);
+}
+/*---------------------------------------------------------------------------*/
+static unsigned short
+make_neighbor(void *arg)
+{
+  struct httpd_state *s = (struct httpd_state *)arg;
+  struct neighbor *n = neighbor_get(s->u.count);
+
+  if(n == NULL) {
+    return 0;
+  }
+
+  return snprintf((char *)uip_appdata, uip_mss(),
+		  "<li><a href=\"http://172.16.%d.%d/\">%d.%d</a>\r\n",
+
+		  n->addr.u8[0], n->addr.u8[1],
+		  n->addr.u8[0], n->addr.u8[1]);
+}
+/*---------------------------------------------------------------------------*/
+static
+PT_THREAD(neighborscall(struct httpd_state *s, char *ptr))
+{
+  PSOCK_BEGIN(&s->sout);
+
+  printf("neighbor_num %d\n", neighbor_num());
+  
+  for(s->u.count = 0; s->u.count < neighbor_num(); s->u.count++) {
+    printf("count %d\n", s->u.count);
+    if(neighbor_get(s->u.count) != NULL) {
+      printf("!= NULL\n");
+      PSOCK_GENERATOR_SEND(&s->sout, make_neighbor, s);
+    }
+  }
+
+  PSOCK_END(&s->sout);
+}
+/*---------------------------------------------------------------------------*/
+
+static void
+adv_received(struct neighbor_discovery_conn *c, rimeaddr_t *from,
+	     uint16_t rtmetric)
+{
+  struct neighbor *n;
+
+  printf("adv_received %d.%d\n", from->u8[0], from->u8[1]);
+  
+  n = neighbor_find(from);
+  
+  if(n == NULL) {
+    neighbor_add(from, rtmetric, 1);
+  } else {
+    neighbor_update(n, rtmetric);
+  }
+}
+
+
+static const struct neighbor_discovery_callbacks neighbor_discovery_callbacks =
+  { adv_received, NULL};
+
+
+HTTPD_CGI_CALL(sensors, "sensors", sensorscall);
+HTTPD_CGI_CALL(nodeid, "nodeid", nodeidcall);
+HTTPD_CGI_CALL(neighbors, "neighbors", neighborscall);
+
+static struct neighbor_discovery_conn conn;
+
+void
+httpd_cgi_init(void)
+{
+  
+  httpd_cgi_add(&sensors);
+  httpd_cgi_add(&nodeid);
+  httpd_cgi_add(&neighbors);
+
+  neighbor_discovery_open(&conn, 31,
+			  CLOCK_SECOND * 2,
+			  CLOCK_SECOND * 10,
+			  CLOCK_SECOND * 60,
+			  &neighbor_discovery_callbacks);
+  neighbor_discovery_start(&conn, 0);
+}
+/*---------------------------------------------------------------------------*/