git.scottworley.com Git - tattlekey/blob - client/net.c

   1 #include "net.h"
   2 #include "blink.h"
   3 #include "config.h"
   4
   5 #include "pico/cyw43_arch.h"
   6
   7 #include "lwip/pbuf.h"
   8 #include "lwip/udp.h"
   9
  10 /* We only ever send to one address, and we only ever have one thread, so just
  11  * use one udp_pcb */
  12 static struct udp_pcb *the_pcb = NULL;
  13
  14 static void initialize_the_pcb() {
  15   if (the_pcb)
  16     return;
  17
  18   the_pcb = udp_new();
  19   if (!the_pcb)
  20     signal_error_by_blinking();
  21
  22   ip_addr_t ipaddr;
  23   if (ip4addr_aton(tattle_server_ip_address, &ipaddr) == 0)
  24     signal_error_by_blinking();
  25
  26   if (udp_connect(the_pcb, &ipaddr, tattle_port) != ERR_OK)
  27     signal_error_by_blinking();
  28 }
  29
  30 struct tattle_message_wire_format {
  31   u16_t sender;
  32   u16_t seq;
  33   u16_t ago;
  34 };
  35
  36 void send_report(u16_t seq, u16_t ago) {
  37   cyw43_arch_lwip_begin();
  38
  39   initialize_the_pcb();
  40
  41   struct pbuf *p = pbuf_alloc(
  42       PBUF_TRANSPORT, sizeof(struct tattle_message_wire_format), PBUF_RAM);
  43   if (!p)
  44     signal_error_by_blinking();
  45
  46   struct tattle_message_wire_format *msg =
  47       (struct tattle_message_wire_format *)(p->payload);
  48   msg->sender = htons(this_tattler_identity);
  49   msg->seq = htons(seq);
  50   msg->ago = htons(ago);
  51
  52   if (udp_send(the_pcb, p) != ERR_OK)
  53     signal_error_by_blinking();
  54
  55   pbuf_free(p);
  56
  57   cyw43_arch_lwip_end();
  58 }