Add option for custom rxPin and txPin with HardwareSerial (e.g. for ESP32)

README.md

@@ -73,6 +73,8 @@ sds.begin(); // you can pass custom baud rate as parameter (9600 by default)
 ```arduino
 SdsDustSensor sds(Serial1); // passing HardwareSerial as parameter, you can tune retry mechanism with additional parameters: retryDelayMs and maxRetriesNotAvailable
 sds.begin(); // you can pass custom baud rate as parameter (9600 by default)
+// or you can pass custom rxPin and txPin to HardwareSerial, if your board (e.g. ESP32) supports remapping of GPIOs to Serial
+// sds.begin(9600, SERIAL_8N1, rxPin, txPin);
 ```
 
 ## Supported operations

src/SdsDustSensor.h

@@ -72,9 +72,9 @@ class SdsDustSensor {
     }
   }
 
-  void begin(int baudRate = 9600) {
-    abstractSerial->begin(baudRate);
-  }
+  void begin(int baudRate = 9600, uint32_t config = SERIAL_8N1, int pinRx = -1, int pinTx = -1) {
+      abstractSerial->begin(baudRate, config, pinRx, pinTx);
+    }
 
   byte *getLastResponse() {
     return response;

src/Serials.h

@@ -17,16 +17,16 @@ namespace Serials {
   // just to satisfy linker in gcc I needed to add empty parentheses to other virtual methods...
   class AbstractSerial {
   public:
-    virtual void begin(int baudRate) = 0;
+    virtual void begin(int baudRate, uint32_t config, int pinRx, int pinTx) = 0;
     virtual Stream *getStream() = 0;
     virtual ~AbstractSerial() {};
   };
 
   struct Hardware: public AbstractSerial {
     Hardware(HardwareSerial &serial): serial(serial) {}
 
-    void begin(int baudRate) {
-      serial.begin(baudRate);
+    void begin(int baudRate = 9600, uint32_t config = SERIAL_8N1, int pinRx = -1, int pinTx = -1) {
+      serial.begin(baudRate, config, pinRx, pinTx);
     }
 
     Stream *getStream() {
@@ -40,7 +40,7 @@ namespace Serials {
   struct Software: public AbstractSerial {
     Software(SoftwareSerial &serial): serial(serial) {}
 
-    void begin(int baudRate) {
+    void begin(int baudRate = 9600, uint32_t config = SERIAL_8N1, int pinRx = -1, int pinTx = -1) {
       serial.begin(baudRate);
     }
 
@@ -61,8 +61,8 @@ namespace Serials {
       }
     }
 
-    void begin(int baudRate) {
-      serial->begin(baudRate);
+    void begin(int baudRate = 9600, uint32_t config = SERIAL_8N1, int pinRx = -1, int pinTx = -1) {
+      serial.begin(baudRate);
     }
 
     Stream *getStream() {