init

.clangd

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+CompileFlags:
+  CompilationDatabase: builddir/ 

.gitignore

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+builddir
+
+subprojects/*
+!subprojects/*.wrap

README.md

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+# Definition
+Tag     are AS IS an e-paper which displays price, ... etc  
+Peer    are AS IS an remote ESP32 that control a tag or tags  
+
+

justfile

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+build:
+    meson compile -C ./builddir/

meshtalos.cpp

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+#include <meshtalos.hpp>
+
+namespace meshtalos {
+extern "C" {
+static void ev_handler(struct mg_connection *c, int ev, void *ev_data) {
+  if (ev == MG_EV_HTTP_MSG) { // New HTTP request received
+    struct mg_http_message *hm =
+        (struct mg_http_message *)ev_data;               // Parsed HTTP request
+    if (mg_match(hm->uri, mg_str("/api/hello"), NULL)) { // REST API call?
+
+      mg_http_reply(c, 200, "", "{%m:%d}\n", MG_ESC("status"),
+                    1); // Yes. Respond JSON
+    } else {
+      struct mg_http_serve_opts opts = {.root_dir = ".", .fs = &mg_fs_posix};
+      mg_http_serve_dir(c, hm, &opts); // For all other URLs, Serve static files
+    }
+  }
+}
+}
+
+Meshtalos::Meshtalos(lfs_t *lfs) : _lfs(lfs) {
+  number = 6;
+  mg_mgr_init(&_mgr);
+}
+
+void Meshtalos::listen() {
+  mg_http_listen(&_mgr, ("http://" + listen_address).c_str(), ev_handler, NULL);
+  for (;;) {
+    mg_mgr_poll(&_mgr, 1000);
+  }
+}
+
+int Meshtalos::get_number() const { return number; }
+
+} // namespace meshtalos

meshtalos.hpp

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+#pragma once
+#include <string>
+#if defined _WIN32 || defined __CYGWIN__
+#ifdef BUILDING_MESHTALOS
+#define MESHTALOS_PUBLIC __declspec(dllexport)
+#else
+#define MESHTALOS_PUBLIC __declspec(dllimport)
+#endif
+#else
+#ifdef BUILDING_MESHTALOS
+#define MESHTALOS_PUBLIC __attribute__((visibility("default")))
+#else
+#define MESHTALOS_PUBLIC
+#endif
+#endif
+
+#include "./mongoose.h"
+#include <lfs.h>
+
+namespace meshtalos {
+
+// Ciallo～(∠・ω< )⌒☆
+class MESHTALOS_PUBLIC Meshtalos {
+
+public:
+  std::string listen_address = "0.0.0.0:8080";
+  lfs_t *_lfs;
+  Meshtalos(lfs_t *lfs = NULL);
+  void listen();
+  int get_number() const;
+
+private:
+  struct mg_mgr _mgr;
+
+  int number;
+};
+
+} // namespace meshtalos

meshtalos_test.cpp

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+#include "./meshtalos.hpp"
+#include <iostream>
+
+int main(int argc, char **argv) {
+  if (argc != 1) {
+    std::cout << argv[0] << " takes no arguments.\n";
+    return 1;
+  }
+  meshtalos::Meshtalos c;
+  c.listen();
+}

meson.build

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+project(
+  'MESHTalos',
+  ['cpp','c'],
+  version : '0.1',
+  meson_version : '>= 1.3.0',
+  default_options : ['warning_level=3', 'cpp_std=c++20', 'c_std=gnu11'],
+)
+
+dependencies = [
+  dependency('littlefs')
+]
+
+# These arguments are only used to build the shared library
+# not the executables that use the library.
+lib_args = ['-DBUILDING_MESHTALOS']
+
+lib = library(
+  'meshtalos',
+  'meshtalos.cpp',
+  './mongoose.c',
+  install : true,
+  cpp_shared_args : lib_args,
+  gnu_symbol_visibility : 'hidden',
+  dependencies : dependencies,
+)
+
+test_exe = executable(
+  'meshtalos_test',
+  'meshtalos_test.cpp',
+  dependencies : dependencies,
+  link_with : lib,
+)
+test('meshtalos', test_exe)
+
+# Make this library usable as a Meson subproject.
+meshtalos_dep = declare_dependency(
+  include_directories : include_directories('.'),
+  dependencies : dependencies,
+  link_with : lib,
+)
+meson.override_dependency('MESHTalos', meshtalos_dep)
+
+# Make this library usable from the system's
+# package manager.
+install_headers('meshtalos.hpp', subdir : 'meshtalos')
+
+pkg_mod = import('pkgconfig')
+pkg_mod.generate(
+  lib,
+  description : 'Meson sample project.',
+  subdirs : 'meshtalos',
+)

storage.hpp

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+#pragma once
+#include <stdint.h>
+#include <vector>
+
+struct TagInfo {
+  char *name;
+  uint32_t price;
+  int32_t sale; // unit is percent, rounded
+};
+
+struct Peer {
+  char peer_id[6];
+  uint64_t last_online;
+  std::vector<TagInfo> tags;
+};

subprojects/littlefs.wrap

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+[wrap-file]
+directory = littlefs-2.11.0
+source_url = https://github.com/littlefs-project/littlefs/archive/refs/tags/v2.11.0.tar.gz
+source_filename = littlefs-2.11.0.tar.gz
+source_hash = 54ed6382d75cbd4898fa89ddc0db7bf82abadfd8b209e12950cb10a05a6dc424
+patch_filename = littlefs_2.11.0-1_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/littlefs_2.11.0-1/get_patch
+patch_hash = a6e963fda9547db589e9ac7b5fcc6a5fd3553a59efe32ac7053e2d0a1053331b
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/littlefs_2.11.0-1/littlefs-2.11.0.tar.gz
+wrapdb_version = 2.11.0-1
+
+[provide]
+littlefs = littlefs_dep