mirror of
https://github.com/cesanta/mongoose.git
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78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
// SPDX-FileCopyrightText: 2026 Cesanta Software Limited
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// SPDX-License-Identifier: GPL-2.0-only or commercial
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#include "mongoose.h"
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#if MG_ARCH == MG_ARCH_UNIX || MG_ARCH == MG_ARCH_WIN32
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#define HTTP_ADDR "http://0.0.0.0:8000"
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#else
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#define HTTP_ADDR "http://0.0.0.0:80"
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#endif
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#define NUM_POINTS 512 // How many data points to send
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#define INTERVAL_MS 200 // How often, in milliseconds
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struct point {
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uint16_t x; // X coordinate of the data point, usually this is time
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uint16_t y1; // We can plot multiple values per graph,
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uint16_t y2; // let's plot 2 values: y1 and y2.
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};
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// This function prints a JSON array of plot points
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size_t print_points(void (*fn)(char, void *), void *arg, va_list *ap) {
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size_t i, n = 0;
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const char *comma = "";
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(void) ap;
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n += mg_xprintf(fn, arg, "[");
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for (i = 0; i < NUM_POINTS; i++) {
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struct point p;
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p.x = (uint16_t) i;
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p.y1 = 50 -
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(uint16_t) ((40 * (i > (NUM_POINTS - 1) / 4
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? i - (NUM_POINTS - 1) / 4
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: (NUM_POINTS - 1) / 4 - i)) /
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(NUM_POINTS - 1)) +
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(rand() % 9);
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p.y2 = 20 + (uint16_t) ((29 * i) / NUM_POINTS) + (rand() % 5);
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n += mg_xprintf(fn, arg, "%s[%hu,%hu,%hu]", comma, p.x, p.y1, p.y2);
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comma = ",";
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}
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n += mg_xprintf(fn, arg, "]");
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return n;
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}
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static void get_points(union mg_val *val) {
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val->fn = (void (*)(void)) print_points;
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}
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// Modify this. This represents device's state to the dashboard
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static struct mg_field fields[] = {
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{"points", MG_VAL_FN, get_points, NULL},
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{NULL, 0, 0, 0},
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};
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struct mg_mgr mgr;
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struct mg_dash dash = {fields};
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void mongoose_init(void) {
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mg_mgr_init(&mgr);
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mg_http_listen(&mgr, HTTP_ADDR, mg_dash_ev_handler, &dash);
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}
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void mongoose_poll(void) {
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mg_mgr_poll(&mgr, 1);
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// Send WS change notifications periodically
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static uint64_t timer = 0;
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if (mg_timer_expired(&timer, INTERVAL_MS, mg_now())) {
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mg_dash_send_change(&mgr, mg_dash_find_field(fields, mg_str("points")));
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}
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}
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int main(void) {
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mongoose_init();
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for (;;) {
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mongoose_poll();
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}
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return 0;
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}
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