[BLE] Add support for decrypting PVVX, BTHome v2 and Victron BLE frames (#2219)

* Changing WebUI to include display device name, and change it to select drop down rather than checkbox

* Fix mqttDiscovery to require WebUI and ESP32 for displayDeviceName

* Fix mqttDiscovery to require WebUI and ESP32 and ESP8266 for displayDeviceName and ForceDeviceName

* Changing WebUI to include display device name, and change it to select drop down rather than checkbox

* Fixes for WebUI and BT for supporting custom setting Display name

* Fixes for WebUI and BT for supporting custom setting Display name

* Move DISPLAY_DEVICE_NAME to User_config.h

* Update docs to include change for Display temperature

* Update docs to include change for Display temperature

* Fix minor cosmetic bug where devices were not linking in HA to the gateway using via_device as it should be the gateway mac address not name

* Add support for decrypting BTHome v2 frames

* Add support for decrypting BTHome v2 frames

* Add support for decrypting BTHome v2 frames

* BTHome fix issue with theengs-plug

* BTHome fix issue with theengs-plug

* Adding support for all BLE encrypted methods, support in UI and gatewayBT for specific MACAddress AES Keys

* Fix lint

* Fix build issue with theengs-bridge-v11 and esp32dev-all-test and revert the documentation to Units of measurement displayed

* Revert docs

* Revert displayDeviceName and Units of measurement

* Revert displayDeviceName and Units of measurement

* Revert displayDeviceName and Units of measurement

* Revert minor typo

* Revert minor typo

* Revert minor typo

* Bug in Victron as nonce should be 16 bytes

* Shortened the client side javascript for BLE key validation that is commented out due to image constrains on theengs-bridge-v11

main/webUI.cpp

@@ -27,6 +27,7 @@
 #  include <WebServer.h> // Docs for this are here - https://github.com/espressif/arduino-esp32/tree/master/libraries/WebServer
 #  include <WiFi.h>
 
+#  include "TheengsCommon.h"
 #  include "config_WebContent.h"
 #  include "config_WebUI.h"
 
@@ -954,6 +955,94 @@ void handleLO() {
   server.send(200, "text/html", response);
 }
 
+#  ifdef BLEDecryptor
+/**
+ * @brief /BL - Config BLE
+ * T: handleBL: uri: /bl, args: 3, method: 1
+ * T: handleBL Arg: 0, dn=on - Force Device Name
+ * T: handleBL Arg: 1, bk=on - BLE AES Key
+ * T: handleBL Arg: 2, save=
+ */
+void handleBL() {
+  WEBUI_TRACE_LOG(F("handleBL: uri: %s, args: %d, method: %d" CR), server.uri(), server.args(), server.method());
+  WEBUI_SECURE
+  StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
+  JsonObject WEBtoSYS = jsonBuffer.to<JsonObject>();
+
+  if (server.args()) {
+    for (uint8_t i = 0; i < server.args(); i++) {
+      WEBUI_TRACE_LOG(F("handleBL Arg: %d, %s=%s" CR), i, server.argName(i).c_str(), server.arg(i).c_str());
+    }
+    bool update = false;
+
+    if (server.hasArg("save")) {
+
+      // Default BLE AES Key
+      if (server.hasArg("bk")) {
+        WEBtoSYS["ble_aes"] = server.arg("bk");
+        update = true;
+      }
+
+      // Split Custom BLE AES key pair string add to config 
+      if (server.hasArg("kp")) {
+        String kp = server.arg("kp");
+        while (kp.length() > 0) {
+          int kpindex = kp.indexOf(' ');
+          if (kpindex == -1) {
+            if (kp.indexOf(':') == 12) {
+              WEBtoSYS["ble_aes_keys"][kp.substring(0, 12)] = kp.substring(13, 45);
+            }
+            break;
+          } else {
+            if (kp.indexOf(':') == 12) {
+              WEBtoSYS["ble_aes_keys"][kp.substring(0, 12)] = kp.substring(13, 45);
+            }
+            kp = kp.substring(kpindex+1);
+          }
+        }
+        update = true;
+      }
+
+      if (update) {
+        Log.warning(F("[BLE] Save Config" CR));
+        String topic = String(mqtt_topic) + String(gateway_name) + String(subjectMQTTtoSYSset);
+        XtoSYS((char*)topic.c_str(), WEBtoSYS);
+      } else {
+        Log.warning(F("[BLE] No changes" CR));
+      }
+    }
+  }
+
+  // Build BLE Key Pair string 
+  std::string aeskeysstring;
+  JsonObject root = ble_aes_keys.as<JsonObject>();
+  for (JsonPair kv : root) {
+    aeskeysstring += kv.key().c_str();
+    aeskeysstring += ":";
+    aeskeysstring += kv.value().as<const char*>();
+    aeskeysstring += " ";
+  }
+  aeskeysstring.pop_back();
+
+  char jsonChar[100];
+  serializeJson(modules, jsonChar, measureJson(modules) + 1);
+
+  char buffer[WEB_TEMPLATE_BUFFER_MAX_SIZE];
+
+  snprintf(buffer, WEB_TEMPLATE_BUFFER_MAX_SIZE, header_html, (String(gateway_name) + " - Configure BLE").c_str());
+  String response = String(buffer);
+  response += String(ble_script);
+  response += String(script);
+  response += String(style);
+  int logLevel = Log.getLevel();
+  snprintf(buffer, WEB_TEMPLATE_BUFFER_MAX_SIZE, config_ble_body, jsonChar, gateway_name, ble_aes, aeskeysstring.c_str());
+  response += String(buffer);
+  snprintf(buffer, WEB_TEMPLATE_BUFFER_MAX_SIZE, footer, OMG_VERSION);
+  response += String(buffer);
+  server.send(200, "text/html", response);
+}
+#  endif
+
 #  ifdef ZgatewayLORA
 #    include "config_LORA.h"
 extern void LORAConfig_fromJson(JsonObject& LORAdata);
@@ -1688,6 +1777,10 @@ void WebUISetup() {
 #  endif
   server.on("/lo", handleLO); // Configure Logging
 
+#  ifdef BLEDecryptor
+  server.on("/bl", HTTP_POST, handleBL); // Configure BLE
+#  endif
+
   server.on("/rt", handleRT); // Reset configuration ( Erase and Restart )
   server.on("/favicon.ico", handleFavicon); // Information
   server.begin();