问题
I'm trying to implement ECC in 6LoWPAN border router. I'm using contiki Wismote motes for all udp_sender.c as sender and the Border router (border_router.c) needs to receive some messages and also reply ECC keys. I have disabled the default server (WITH_WEBSERVER=0) in makefile and enabled debug_print.
udp_sender.c sends messages correctly but the border router doesn't receive messages. Nothing executes after PROCESS_YIELD in border_router.c
while(1) {
PROCESS_YIELD(); **//Nothing executes from this point**
if(ev == tcpip_event) {
tcpip_handler();
} else if (ev == sensors_event && data == &button_sensor) {
PRINTF("Initiaing global repair\n");
rpl_repair_root(RPL_DEFAULT_INSTANCE);
}
}
`
#define DEBUG DEBUG_PRINT
#include "net/uip-debug.h"
uint16_t dag_id[] = {0x1111, 0x1100, 0, 0, 0, 0, 0, 0x0011};
static uip_ipaddr_t prefix;
static uint8_t prefix_set;
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define UDP_CLIENT_PORT 8765
#define UDP_SERVER_PORT 5678
static struct uip_udp_conn *server_conn;
PROCESS(border_router_process, "Border router process");
PROCESS(startup_process, "Startup process");
#if WEBSERVER==0
/* No webserver */
AUTOSTART_PROCESSES(&startup_process, &border_router_process);
#elif WEBSERVER>1
/* Use an external webserver application */
#include "webserver-nogui.h"
AUTOSTART_PROCESSES(&border_router_process,&webserver_nogui_process);
#else
#include "httpd-simple.h"
#define WEBSERVER_CONF_LOADTIME 0
#define WEBSERVER_CONF_FILESTATS 0
#define WEBSERVER_CONF_NEIGHBOR_STATUS 0
#define WEBSERVER_CONF_ROUTE_LINKS 0
#if WEBSERVER_CONF_ROUTE_LINKS
#define BUF_USES_STACK 1
#endif
PROCESS ( startup_process, "Statup Process" );
PROCESS(webserver_nogui_process, "Web server");
PROCESS_THREAD(webserver_nogui_process, ev, data)
{
PROCESS_BEGIN();
httpd_init();
while(1) {
PROCESS_WAIT_EVENT_UNTIL(ev == tcpip_event);
httpd_appcall(data);
}
PROCESS_END();
}
AUTOSTART_PROCESSES(&border_router_process,&webserver_nogui_process, &startup_process);
//webserver codes
/*-----------------------------------------*/
static void
tcpip_handler(void)
{
char *appdata;
if(uip_newdata()) {
appdata = (char *)uip_appdata;
appdata[uip_datalen()] = 0;
PRINTF("DATA recv '%s' from ", appdata);
PRINTF("%d",
UIP_IP_BUF->srcipaddr.u8[sizeof(UIP_IP_BUF->srcipaddr.u8) - 1]);
PRINTF("\n");
#if SERVER_REPLY
PRINTF("DATA sending reply\n");
uip_ipaddr_copy(&server_conn->ripaddr, &UIP_IP_BUF->srcipaddr);
uip_udp_packet_send(server_conn, "Reply", sizeof("Reply"));
uip_create_unspecified(&server_conn->ripaddr);
#endif
}
}
PROCESS_THREAD ( startup_process, ev, data )
{
PROCESS_BEGIN();
//some ECC codes here
process_start ( &border_router_process, ev );
PROCESS_END();
}
PROCESS_THREAD(border_router_process, ev, data)
{
static struct etimer et;
rpl_dag_t *dag;
PROCESS_BEGIN();
....
.....
server_conn = udp_new(NULL, UIP_HTONS(UDP_CLIENT_PORT), NULL);
if(server_conn == NULL) {
PRINTF("No UDP connection available, exiting the process!\n");
PROCESS_EXIT();
}
udp_bind(server_conn, UIP_HTONS(UDP_SERVER_PORT));
PRINTF("Created a server connection with remote address ");
PRINT6ADDR(&server_conn->ripaddr);
PRINTF(" local/remote port %u/%u\n", UIP_HTONS(server_conn->lport),
UIP_HTONS(server_conn->rport));
while(1) {
PROCESS_YIELD();
//Nothing executes from this point
if(ev == tcpip_event) {
tcpip_handler();
} else if (ev == sensors_event && data == &button_sensor) {
PRINTF("Initiaing global repair\n");
rpl_repair_root(RPL_DEFAULT_INSTANCE);
}
}
PROCESS_END();
}
Here is my output
08:46.163 ID:2 Rime started with address 0.0.0.0.0.0.0.2
08:46.174 ID:2 MAC 00:00:00:00:00:00:00:02 Contiki 2.6 started. Node id is set to 2.
08:46.183 ID:2 nullmac nullrdc, channel check rate 128 Hz, radio channel 26
08:46.194 ID:2 Tentative link-local IPv6 address fe80:0000:0000:0000:0200:0000:0000:0002
08:46.199 ID:2 Starting 'UDP client process'
08:46.207 ID:2 ECC INITIALIZED: key bit len: 128 NN_DIGIT_BITS: 16
08:46.660 ID:1 Rime started with address 0.0.0.0.0.0.0.1
08:46.672 ID:1 MAC 00:00:00:00:00:00:00:01 Contiki 2.6 started. Node id is set to 1.
08:46.681 ID:1 nullmac nullrdc, channel check rate 128 Hz, radio channel 26
08:46.693 ID:1 Tentative link-local IPv6 address fe80:0000:0000:0000:0200:0000:0000:0001
08:46.697 ID:1 Starting 'Startup process'
08:46.701 ID:1 Inside STARTUP process
08:46.708 ID:1 ECC INITIALIZED: key bit len: 128 NN_DIGIT_BITS: 16
08:46.711 ID:2 # [1024 bytes, no line ending]: ...
08:46.938 ID:2 # [1024 bytes, no line ending]: ...
08:49.078 ID:1 # [1024 bytes, no line ending]: ...
08:49.207 ID:2 UDP client process started
08:49.213 ID:2 Client IPv6 addresses: aaaa::200:0:0:2
08:49.215 ID:2 fe80::200:0:0:2
08:49.224 ID:2 Created a connection with the server :: local/remote port 8765/5678
08:49.311 ID:1 # [1024 bytes, no line ending]: ...
08:49.545 ID:1 # [1024 bytes, no line ending]: ...
08:49.778 ID:1 # [1024 bytes, no line ending]: ...
08:50.010 ID:1 # [1024 bytes, no line ending]: ...
08:50.242 ID:1 # [1024 bytes, no line ending]: ...
08:50.475 ID:1 # [1024 bytes, no line ending]: ...
08:50.748 ID:1 # [1024 bytes, no line ending]: ...
08:50.751 ID:1 der router process
08:50.756 ID:1 RPL-Border router started
08:50.766 ID:1 ?PGot configuration message of type P
08:50.769 ID:1 Setting prefix aaaa::
08:51.758 ID:1 after PREFIX
08:51.761 ID:1 created a new RPL dag
08:51.765 ID:1 Server IPv6 addresses:
08:51.768 ID:1 aaaa::200:0:0:1
08:51.770 ID:1 fe80::200:0:0:1
08:51.782 ID:1 Created a server connection with remote address :: local/remote port 5678/8765
10:40.719 ID:2 DATA send to 1 'Hello 1'
11:38.321 ID:2 DATA send to 1 'Hello 2'
12:24.887 ID:2 DATA send to 1 'Hello 3'
13:37.051 ID:2 DATA send to 1 'Hello 4'
14:22.934 ID:2 DATA send to 1 'Hello 5'
15:24.160 ID:2 DATA send to 1 'Hello 6'
16:01.856 ID:2 DATA send to 1 'Hello 7'
\\more messages like above
来源：https://stackoverflow.com/questions/57484641/contiki-br-not-executing-tcp-ip-event-doesnt-goes-after-process-yield