move to new skeleton

tutorials/webui/webui-plain/main.c

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+// Copyright (c) 2022 Cesanta Software Limited
+// All rights reserved
+//
+// UI example
+// It implements the following endpoints:
+//    /api/config/get - respond with current config
+//    /api/config/set - POST a config change
+//    any other URI serves static files from s_root_dir
+// Data and results are JSON strings
+
+#include "mongoose.h"
+
+static const char *s_http_addr = "http://localhost:8000";  // HTTP port
+static const char *s_root_dir = "web_root";
+#define MQTT_SERVER "mqtt://broker.hivemq.com:1883"
+#define MQTT_PUBLISH_TOPIC "mg/my_device"
+#define MQTT_SUBSCRIBE_TOPIC "mg/#"
+
+static struct config {
+  char *url, *pub, *sub;
+} s_config;
+
+// Try to update a single configuration value
+static void update_config(struct mg_str json, const char *path, char **value) {
+  char *jval;
+  if ((jval = mg_json_get_str(json, path)) != NULL) {
+    free(*value);
+    *value = strdup(jval);
+  }
+}
+
+static void fn(struct mg_connection *c, int ev, void *ev_data) {
+  if (ev == MG_EV_OPEN && c->is_listening) {
+    s_config.url = strdup(MQTT_SERVER);
+    s_config.pub = strdup(MQTT_PUBLISH_TOPIC);
+    s_config.sub = strdup(MQTT_SUBSCRIBE_TOPIC);
+  } else if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    if (mg_match(hm->uri, mg_str("/api/config/get"), NULL)) {
+      mg_http_reply(c, 200, "Content-Type: application/json\r\n",
+                    "{%m:%m,%m:%m,%m:%m}\n", MG_ESC("url"),
+                    MG_ESC(s_config.url), MG_ESC("pub"), MG_ESC(s_config.pub),
+                    MG_ESC("sub"), MG_ESC(s_config.sub));
+    } else if (mg_match(hm->uri, mg_str("/api/config/set"), NULL)) {
+      struct mg_str json = hm->body;
+      update_config(json, "$.url", &s_config.url);
+      update_config(json, "$.pub", &s_config.pub);
+      update_config(json, "$.sub", &s_config.sub);
+      mg_http_reply(c, 200, "", "ok\n");
+    } else {
+      struct mg_http_serve_opts opts = {.root_dir = s_root_dir};
+      mg_http_serve_dir(c, ev_data, &opts);
+    }
+  }
+}
+
+int main(void) {
+  struct mg_mgr mgr;                            // Event manager
+  mg_log_set(MG_LL_INFO);                       // Set to 3 to enable debug
+  mg_mgr_init(&mgr);                            // Initialise event manager
+  mg_http_listen(&mgr, s_http_addr, fn, NULL);  // Create HTTP listener
+  for (;;) mg_mgr_poll(&mgr, 1000);             // Infinite event loop
+  mg_mgr_free(&mgr);
+  return 0;
+}