README: Fix image path for display in gitweb

[tattlekey] / client / net.c

diff --git a/client/net.c b/client/net.c
index 9ced48f2864364abaee1083174bdb9472682f102..3d4be8cea998f707472740155a601ea912f46001 100644 (file)
--- a/client/net.c
+++ b/client/net.c
@@ -1,8 +1,26 @@
+/* tattlekey: A one-key UDP keyboard
+ * Copyright (C) 2023  Scott Worley <scottworley@scottworley.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+

 #include "net.h"
 #include "blink.h"
 #include "config.h"
 
 #include "pico/cyw43_arch.h"
 #include "net.h"
 #include "blink.h"
 #include "config.h"
 
 #include "pico/cyw43_arch.h"

+#include "pico/rand.h"

 
 #include "lwip/pbuf.h"
 #include "lwip/udp.h"
 
 #include "lwip/pbuf.h"
 #include "lwip/udp.h"


@@ -10,11 +28,14 @@
 /* We only ever send to one address, and we only ever have one thread, so just
  * use one udp_pcb */
 static struct udp_pcb *the_pcb = NULL;
 /* We only ever send to one address, and we only ever have one thread, so just
  * use one udp_pcb */
 static struct udp_pcb *the_pcb = NULL;

+static uint32_t epoch = 0;

 
 

-static void initialize_the_pcb() {
+static void net_local_init() {

   if (the_pcb)
     return;
 
   if (the_pcb)
     return;
 

+  new_epoch();
+

   the_pcb = udp_new();
   if (!the_pcb)
     signal_error_by_blinking();
   the_pcb = udp_new();
   if (!the_pcb)
     signal_error_by_blinking();


@@ -27,16 +48,19 @@ static void initialize_the_pcb() {
     signal_error_by_blinking();
 }
 
     signal_error_by_blinking();
 }
 

+void new_epoch() { epoch = get_rand_32(); }
+

 struct tattle_message_wire_format {
 struct tattle_message_wire_format {

+  u32_t epoch;

   u16_t sender;
   u16_t seq;
   u16_t sender;
   u16_t seq;

-  u16_t ago;
+  u32_t ago;

 };
 
 };
 

-void send_report(u16_t seq, u16_t ago) {
+void send_report_packet(u16_t seq, u32_t ago) {

   cyw43_arch_lwip_begin();
 
   cyw43_arch_lwip_begin();
 

-  initialize_the_pcb();
+  net_local_init();

 
   struct pbuf *p = pbuf_alloc(
       PBUF_TRANSPORT, sizeof(struct tattle_message_wire_format), PBUF_RAM);
 
   struct pbuf *p = pbuf_alloc(
       PBUF_TRANSPORT, sizeof(struct tattle_message_wire_format), PBUF_RAM);


@@ -45,9 +69,10 @@ void send_report(u16_t seq, u16_t ago) {
 
   struct tattle_message_wire_format *msg =
       (struct tattle_message_wire_format *)(p->payload);
 
   struct tattle_message_wire_format *msg =
       (struct tattle_message_wire_format *)(p->payload);

+  msg->epoch = htonl(epoch);

   msg->sender = htons(config_this_tattler_identity);
   msg->seq = htons(seq);
   msg->sender = htons(config_this_tattler_identity);
   msg->seq = htons(seq);

-  msg->ago = htons(ago);
+  msg->ago = htonl(ago);

 
   if (udp_send(the_pcb, p) != ERR_OK)
     signal_error_by_blinking();
 
   if (udp_send(the_pcb, p) != ERR_OK)
     signal_error_by_blinking();