Add esp-idf compatibility

* Update to 2023.2.4
* Fix device class for wifi signal strength

vaillant.yaml

@@ -4,9 +4,11 @@ esphome:
     - vaillantx6.h
 
 esp32:
-  board: az-delivery-devkit-v4
+  #board: az-delivery-devkit-v4
+  board: esp32dev
   framework:
-    type: arduino
+    #type: arduino
+    type: esp-idf
 
 debug:
   update_interval: 10s
@@ -20,7 +22,8 @@ syslog:
 
 # Enable Home Assistant API
 api:
-  password: !secret api_password
+  encryption:
+    key: !secret api_encryption_key
 
 ota:
   password: !secret ota_password
@@ -34,7 +37,7 @@ wifi:
     ssid: "Vaillant Fallback Hotspot"
     password: !secret ap_password
 
-captive_portal:
+#captive_portal:
 
 switch:
   - platform: restart
@@ -60,6 +63,7 @@ sensor:
     unit_of_measurement: "%"
     update_interval: 60s
     entity_category: "diagnostic"
+    device_class: ""
   - platform: debug
     free:
       name: "Heap Free"

vaillantx6.h

@@ -1,9 +1,12 @@
 #include "esphome.h"
+#include <string>
 
 #define CMD_LENGTH 7
 #define ANSWER_LENGTH 8
 #define RETURN_TYPE_COUNT 3
 
+typedef unsigned char byte;
+
 void logCmd(const char *tag, byte *cmd)
 {
   ESP_LOGD("Vaillantx6", "%s: 0x%.2x 0x%.2x 0x%.2x 0x%.2x 0x%.2x 0x%.2x 0x%.2x", tag, cmd[0], cmd[1], cmd[2], cmd[3], cmd[4], cmd[5], cmd[6]);
@@ -57,7 +60,7 @@ int VaillantParseBool(byte *answerBuff, uint8_t offset)
 
 struct VaillantCommand
 {
-  String Name;
+  std::string Name;
   byte Address;
   VaillantReturnTypes ReturnTypes[RETURN_TYPE_COUNT];
   // SensorID contains the ID of the sensor to use, corresponding to the ReturnType.
@@ -268,6 +271,8 @@ class Vaillantx6 : public PollingComponent,
         switch (vaillantCommands[i].ReturnTypes[t])
         {
         case None:
+        case SensorState:
+          // FIXME: This ignores the sensor state, it probably should not.
           // Exit the loop on first None type, there won't be more
           goto exit_type_loop;
         case Temperature: