Contiki UDP Send problem

Serdar Köse

I am using the below code to send UDP packets to a server (through an edge router) that listens IPv6 UDP packets.

static void send_msg_server( uint8_t *data, uint16_t dataLength ){
uip_ipaddr_t address = {0xbb, 0xbb, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01};
client_conn = udp_new( &address, UIP_HTONS(SERVER_PORT), NULL);

udp_bind(client_conn, UIP_HTONS(SERVER_PORT));

uip_udp_packet_send(client_conn, data, dataLength);
uip_udp_remove(client_conn);
}

I use the function for three conditions, pin interrupt, GPT interrupt occurs, or when it receives a packet from a neighbor node.

The weird thing is that it sometimes sends UDP packet, sometime not. I monitor the traffic on Wireshark, so that I confirm if the packets are sent or not.

I am using IAR port. I wonder if the issue is with my IAR port or is it a Contiki related issue?

over 8 years ago

0 YiKai Chen over 8 years ago

Guru 735685 points

Not sure if this is caused by IAR port but you can set a breakpoint on the UDP send function and check if every time UDP send function is called and you can see UDP packet on sniffer or not first.

0 Serdar Köse over 8 years ago in reply to YiKai Chen

Genius 3360 points

Yes, I put a breaking point on the function and it is called as it is expected, I stepped-in the functions and the values doesn't look weird, but it sometime sends the packet, sometimes fails.

Can I call that function anytime and anywhere of the Contiki project or do I need something like this PROCESS_WAIT_EVENT_UNTIL(ev == tcpip_event); then can use the UDP socket?

0 YiKai Chen over 8 years ago in reply to Serdar Köse

Guru 735685 points

I think it's no problem to call that function anytime and anywhere but don't call it in very short interval.

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Contiki UDP Send problem