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https://github.com/cesanta/mongoose.git
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210 lines
6.8 KiB
C
210 lines
6.8 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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// Action buttons
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static bool s_action1, s_action2;
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static uint64_t s_action2_timeout;
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static void write_actions(void) {
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if (s_action2 == true) s_action2_timeout = mg_now() + 750;
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}
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static void read_actions(void) {
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if (s_action2_timeout > mg_now()) s_action2 = true;
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}
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static struct mg_field fields_actions[] = {
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{"action1", MG_VAL_BOOL, &s_action1, sizeof(s_action1)},
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{"action2", MG_VAL_BOOL, &s_action2, sizeof(s_action2)},
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{NULL, MG_VAL_INT, NULL, 0},
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};
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static struct mg_field_set set_actions = {
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"actions", fields_actions, read_actions, write_actions, 0, 0, NULL,
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};
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// Control panel
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// s_led1, s_led2, s_led3 are used to communicate LED status
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static bool s_led1, s_led2, s_led3;
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static void write_leds(void) {
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// gpio_write(LED1_PIN, s_led1);
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// gpio_write(LED2_PIN, s_led2);
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// gpio_write(LED3_PIN, s_led3);
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}
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static void read_leds(void) {
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// s_led1 = gpio_read(LED1_PIN);
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// s_led2 = gpio_read(LED2_PIN);
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// s_led3 = gpio_read(LED3_PIN);
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}
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static struct mg_field fields_leds[] = {
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{"led1", MG_VAL_BOOL, &s_led1, sizeof(s_led1)},
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{"led2", MG_VAL_BOOL, &s_led2, sizeof(s_led2)},
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{"led3", MG_VAL_BOOL, &s_led3, sizeof(s_led3)},
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{NULL, MG_VAL_INT, NULL, 0},
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};
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static struct mg_field_set set_leds = {
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"leds", fields_leds, read_leds, write_leds, 0, 0, NULL,
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};
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// Read-only device Metrics
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static int s_ram = 32, s_cpu = 7;
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static double s_temperature = 24.8;
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static void read_metrics(void) {
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s_ram = 25 + (rand() % 16); // Sumulate metric change
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s_cpu = 7 + (rand() % 21);
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s_temperature = 14.8 + ((double) rand() / RAND_MAX) * 20.0;
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}
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static struct mg_field fields_metrics[] = {
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{"ram", MG_VAL_INT, &s_ram, sizeof(s_ram)},
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{"cpu", MG_VAL_INT, &s_cpu, sizeof(s_cpu)},
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{"temperature", MG_VAL_DBL, &s_temperature, sizeof(s_temperature)},
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{NULL, MG_VAL_INT, NULL, 0},
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};
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static struct mg_field_set set_metrics = {
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"metrics", fields_metrics, read_metrics, NULL, 0, 0, NULL,
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};
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// Read-write device settings
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static double s_volume = 17.2;
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static int s_log_level = MG_LL_DEBUG;
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static char s_name[20] = "Dublin";
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static void write_settings(void) {
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mg_log_level = s_log_level;
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}
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static void read_settings(void) {
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s_log_level = mg_log_level;
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}
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static struct mg_field fields_settings[] = {
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{"volume", MG_VAL_DBL, &s_volume, sizeof(s_volume)},
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{"name", MG_VAL_STR, &s_name, sizeof(s_name)},
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{"log_level", MG_VAL_INT, &s_log_level, sizeof(s_log_level)},
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{NULL, MG_VAL_INT, NULL, 0},
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};
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static struct mg_field_set set_settings = {
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"settings", fields_settings, read_settings, write_settings, 0, 0, NULL,
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};
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#define NUM_POINTS_GRAPH1 7 // How many graph1 data points to send
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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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// Serialise chart data into a string: [[x,y1,y2],[x,y1,y2],...]
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// One uint16_t takes 5 character max, so one entry is 19 bytes max.
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// We could be more efficient by storing hex or base64-encoded data, but
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// let's keep it simple. However if we do, update data parsing logic in
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// the web_root/main.js
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#define POINT_SIZE 19
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static char s_graph1_data[NUM_POINTS_GRAPH1 * POINT_SIZE + 2 + 1];
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// Randomly generate graph points and serialise them into a string
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void read_graph1(void) {
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size_t i, len = 0;
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len += mg_snprintf(s_graph1_data + len, sizeof(s_graph1_data) - len, "[");
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for (i = 0; i < NUM_POINTS_GRAPH1; i++) {
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struct point p;
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p.x = (uint16_t) i;
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p.y1 = 85 - (uint16_t) ((49 * i) / NUM_POINTS_GRAPH1) + (rand() % 9);
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p.y2 = 20 + (uint16_t) ((69 * i) / NUM_POINTS_GRAPH1) + (rand() % 5);
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len += mg_snprintf(s_graph1_data + len, sizeof(s_graph1_data) - len,
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"%s[%hu,%hu,%hu]", i > 0 ? "," : "", p.x, p.y1, p.y2);
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}
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len += mg_snprintf(s_graph1_data + len, sizeof(s_graph1_data) - len, "]");
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}
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static struct mg_field fields_graph1[] = {
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{"data", MG_VAL_RAW, s_graph1_data, sizeof(s_graph1_data)},
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{NULL, MG_VAL_INT, NULL, 0},
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};
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static struct mg_field_set set_graph1 = {
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"graph1", fields_graph1, read_graph1, NULL, 0, 0, NULL,
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};
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#define NUM_POINTS_GRAPH2 100 // How many graph2 data points to send
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static char s_graph2_data[NUM_POINTS_GRAPH2 * 4 + 2 + 1];
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static bool s_graph2_report = true;
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// Adjust t += 7, i * 9, and i * 3
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void read_graph2(void) {
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static uint16_t t;
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size_t i, len = 0;
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len = mg_snprintf(s_graph2_data, sizeof(s_graph2_data), "[");
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t += 23;
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for (i = 0; i < NUM_POINTS_GRAPH2; i++) {
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uint16_t x = (uint16_t) (i * 7 + t);
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uint16_t y = (uint16_t) (i * 3 - t / 2);
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uint8_t a = (x ^ (x >> 3)) & 255;
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uint8_t b = (y ^ (y >> 4)) & 255;
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int v =
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70 + ((a < 128 ? a : 255 - a) >> 1) + ((b < 128 ? b : 255 - b) >> 2);
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len += mg_snprintf(s_graph2_data + len, sizeof(s_graph2_data) - len,
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"%s%hhu", i > 0 ? "," : "", (uint8_t) v);
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}
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len += mg_snprintf(s_graph2_data + len, sizeof(s_graph2_data) - len, "]");
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}
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static struct mg_field fields_graph2[] = {
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{"data", MG_VAL_RAW, s_graph2_data, sizeof(s_graph2_data)},
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{"report", MG_VAL_BOOL, &s_graph2_report, sizeof(s_graph2_report)},
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{NULL, MG_VAL_INT, NULL, 0},
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};
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static struct mg_field_set set_graph2 = {
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"graph2", fields_graph2, read_graph2, NULL, 0, 0, NULL,
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};
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static int authenticate(const char *user, const char *pass) {
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int level = 0; // Authentication failure
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if (strcmp(pass, "admin") == 0) {
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level = 7; // Administrator
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} else if (strcmp(pass, "user") == 0) {
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level = 3; // Ordinary dude
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}
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(void) user;
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return level;
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}
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void mg_dash_init(struct mg_mgr *mgr) {
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static struct mg_dash dash; // Important: keep it static!
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MG_DASH_ADD_FIELD_SET(&dash, &set_leds);
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MG_DASH_ADD_FIELD_SET(&dash, &set_metrics);
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MG_DASH_ADD_FIELD_SET(&dash, &set_settings);
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MG_DASH_ADD_FIELD_SET(&dash, &set_graph1);
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MG_DASH_ADD_FIELD_SET(&dash, &set_graph2);
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MG_DASH_ADD_FIELD_SET(&dash, &set_actions);
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// Add two fake files - for demonstration
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mg_dash_file_add(mg_str("device-config.json"), 1234);
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mg_dash_file_add(mg_str("device-log-2026-04-25.txt"), 1327854);
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// Require authentication
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dash.authenticate = authenticate;
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mg_http_listen(mgr, MG_HTTP_ADDR, mg_dash_ev_handler, &dash);
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}
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void mg_dash_poll(struct mg_mgr *mgr) {
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// Send metrics change periodically
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static uint64_t timer1 = 0, timer2 = 0;
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if (mg_timer_expired(&timer1, 30000, mg_now())) {
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mg_dash_send_change(mgr, &set_metrics);
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}
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if (mg_timer_expired(&timer2, 120, mg_now()) && s_graph2_report) {
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mg_dash_send_change(mgr, &set_graph2);
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}
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if (s_action2 == true && s_action2_timeout < mg_now()) {
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s_action2 = false;
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mg_dash_send_change(mgr, &set_actions);
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}
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}
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