]>
Commit | Line | Data |
---|---|---|
1 | /* tattlekey: A one-key UDP keyboard | |
2 | * Copyright (C) 2023 Scott Worley <scottworley@scottworley.com> | |
3 | * | |
4 | * This program is free software: you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 3 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include "net.h" | |
19 | #include "blink.h" | |
20 | #include "config.h" | |
21 | ||
22 | #include "pico/cyw43_arch.h" | |
23 | ||
24 | #include "lwip/pbuf.h" | |
25 | #include "lwip/udp.h" | |
26 | ||
27 | /* We only ever send to one address, and we only ever have one thread, so just | |
28 | * use one udp_pcb */ | |
29 | static struct udp_pcb *the_pcb = NULL; | |
30 | ||
31 | static void initialize_the_pcb() { | |
32 | if (the_pcb) | |
33 | return; | |
34 | ||
35 | the_pcb = udp_new(); | |
36 | if (!the_pcb) | |
37 | signal_error_by_blinking(); | |
38 | ||
39 | ip_addr_t ipaddr; | |
40 | if (ip4addr_aton(config_tattle_server_ip_address, &ipaddr) == 0) | |
41 | signal_error_by_blinking(); | |
42 | ||
43 | if (udp_connect(the_pcb, &ipaddr, config_tattle_port) != ERR_OK) | |
44 | signal_error_by_blinking(); | |
45 | } | |
46 | ||
47 | struct tattle_message_wire_format { | |
48 | u16_t sender; | |
49 | u16_t seq; | |
50 | u16_t ago; | |
51 | }; | |
52 | ||
53 | void send_report_packet(u16_t seq, u16_t ago) { | |
54 | cyw43_arch_lwip_begin(); | |
55 | ||
56 | initialize_the_pcb(); | |
57 | ||
58 | struct pbuf *p = pbuf_alloc( | |
59 | PBUF_TRANSPORT, sizeof(struct tattle_message_wire_format), PBUF_RAM); | |
60 | if (!p) | |
61 | signal_error_by_blinking(); | |
62 | ||
63 | struct tattle_message_wire_format *msg = | |
64 | (struct tattle_message_wire_format *)(p->payload); | |
65 | msg->sender = htons(config_this_tattler_identity); | |
66 | msg->seq = htons(seq); | |
67 | msg->ago = htons(ago); | |
68 | ||
69 | if (udp_send(the_pcb, p) != ERR_OK) | |
70 | signal_error_by_blinking(); | |
71 | ||
72 | pbuf_free(p); | |
73 | ||
74 | cyw43_arch_lwip_end(); | |
75 | } |