Compiling example-mesh.c Contiki - contiki

Question

How do I fix this error:
undefined reference to button sensor
when compiling example-mesh.c using Micaz mote in contiki?
Here is my code I run the simulation in the mote output window only 3 messages are sent while the rest is " packet timedout " how can I solve that problem to send messages based on timer value ?
#include "contiki.h"
#include "net/rime.h"
#include "net/rime/mesh.h"
#include "contiki-conf.h"
#include "sys/etimer.h"
#include "sys/process.h"
#include "sys/ctimer.h"
#include "dev/leds.h"
#include <stdio.h>
#include <string.h>
#define MESSAGE "Hello"
static struct mesh_conn mesh;
/*---------------------------------------------------------------------------*/
PROCESS(example_mesh_process, "Mesh example");
AUTOSTART_PROCESSES(&example_mesh_process);
/*---------------------------------------------------------------------------*/
static void
sent(struct mesh_conn *c)
{
printf("packet sent\n");
}
static void
timedout(struct mesh_conn *c)
{
printf("packet timedout\n");
}
static void
recv(struct mesh_conn *c, const rimeaddr_t *from, uint8_t hops)
{
printf("Data received from %d.%d: %.*s (%d)\n",
from->u8[0], from->u8[1],
packetbuf_datalen(), (char *)packetbuf_dataptr(), packetbuf_datalen());
packetbuf_copyfrom(MESSAGE, strlen(MESSAGE));
mesh_send(&mesh, from);
}
const static struct mesh_callbacks callbacks = {recv, sent, timedout};
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(example_mesh_process, ev, data)
{
static struct etimer et;
PROCESS_EXITHANDLER(mesh_close(&mesh);)
PROCESS_BEGIN();
mesh_open(&mesh, 132, &callbacks);
while(1) {
rimeaddr_t addr;
etimer_set(&et, 5 * CLOCK_SECOND);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
etimer_reset(&et);
/* Send a message to node number 1. */
packetbuf_copyfrom(MESSAGE, strlen(MESSAGE));
addr.u8[0] = 1;
addr.u8[1] = 0;
mesh_send(&mesh, &addr);
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/

Answer 1

As far as I know the Micaz mote does not have a button and therefore the reference to the button_sensor sensor is not valid.
The example is designed to send a message every time the button is pressed so if you want this example to work you need to rewrite the example to send messages based on a timer value.

Answer 2

This is how I would write it. However this node is dependent on another node that needs to accept the messages!
#include "contiki.h"
#include "net/rime.h"
#include "net/rime/mesh.h"
#include <stdio.h>
#include <string.h>
#define MESSAGE "Hello"
static struct mesh_conn mesh;
/*---------------------------------------------------------------------------*/
PROCESS(example_mesh_process, "Mesh example");
AUTOSTART_PROCESSES(&example_mesh_process);
/*---------------------------------------------------------------------------*/
static void
sent(struct mesh_conn *c)
{
printf("packet sent\n");
}
static void
timedout(struct mesh_conn *c)
{
printf("packet timedout\n");
}
static void
recv(struct mesh_conn *c, const rimeaddr_t *from, uint8_t hops)
{
printf("Data received from %d.%d: %.*s (%d)\n",
from->u8[0], from->u8[1],
packetbuf_datalen(), (char *)packetbuf_dataptr(), packetbuf_datalen());
packetbuf_copyfrom(MESSAGE, strlen(MESSAGE));
mesh_send(&mesh, from);
}
const static struct mesh_callbacks callbacks = {recv, sent, timedout};
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(example_mesh_process, ev, data)
{
static struct etimer et;
PROCESS_EXITHANDLER(mesh_close(&mesh);)
PROCESS_BEGIN();
mesh_open(&mesh, 132, &callbacks);
while(1) {
linkaddr_t addr;
etimer_set(&et, 5 * CLOCK_SECOND);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
/* Send a message to node number 1. */
packetbuf_copyfrom(MESSAGE, strlen(MESSAGE));
addr.u8[0] = 1;
addr.u8[1] = 0;
mesh_send(&mesh, &addr);
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/