init

lib/framework/SettingValue.cpp

@@ -0,0 +1,55 @@
+#include <SettingValue.h>
+
+namespace SettingValue {
+
+#ifdef ESP32
+const String PLATFORM = "esp32";
+#elif defined(ESP8266)
+const String PLATFORM = "esp8266";
+#endif
+
+/**
+ * Returns a new string after replacing each instance of the pattern with a value generated by calling the provided
+ * callback.
+ */
+String replaceEach(String value, String pattern, String (*generateReplacement)()) {
+  while (true) {
+    int index = value.indexOf(pattern);
+    if (index == -1) {
+      break;
+    }
+    value = value.substring(0, index) + generateReplacement() + value.substring(index + pattern.length());
+  }
+  return value;
+}
+
+/**
+ * Generates a random number, encoded as a hex string.
+ */
+String getRandom() {
+  return String(random(2147483647), HEX);
+}
+
+/**
+ * Uses the station's MAC address to create a unique id for each device.
+ */
+String getUniqueId() {
+  uint8_t mac[6];
+#ifdef ESP32
+  esp_read_mac(mac, ESP_MAC_WIFI_STA);
+#elif defined(ESP8266)
+  wifi_get_macaddr(STATION_IF, mac);
+#endif
+  char macStr[13] = {0};
+  sprintf(macStr, "%02x%02x%02x%02x%02x%02x", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+  return String(macStr);
+}
+
+String format(String value) {
+  value = replaceEach(value, "#{random}", getRandom);
+  value.replace("#{unique_id}", getUniqueId());
+  value.replace("#{platform}", PLATFORM);
+  return value;
+}
+
+};  // end namespace SettingValue