[Serial] Add setXxBufferSize functions

lib/ESPEasySerial/ESPEasySerial.cpp

@@ -246,6 +246,22 @@ void ESPeasySerial::setDebugOutput(bool enable)
   }
 }
 
+size_t ESPeasySerial::setRxBufferSize(size_t new_size)
+{
+  if (isValid()) {
+    return _serialPort->setRxBufferSize(new_size);
+  }
+  return 0;
+}
+
+size_t ESPeasySerial::setTxBufferSize(size_t new_size)
+{
+  if (isValid()) {
+    return _serialPort->setTxBufferSize(new_size);
+  }
+  return 0;
+}
+
 bool ESPeasySerial::isTxEnabled(void)
 {
   return getTxPin() != -1;

lib/ESPEasySerial/ESPeasySerial.h

@@ -122,6 +122,11 @@ public:
 
   void   setDebugOutput(bool);
 
+  // Set buffer size, should be called before calling begin()
+  size_t setRxBufferSize(size_t new_size);
+  size_t setTxBufferSize(size_t new_size);
+
+
   bool   isTxEnabled(void);
   bool   isRxEnabled(void);
 

lib/ESPEasySerial/Port_ESPEasySerial_base.h

@@ -45,7 +45,7 @@ public:
 
   inline size_t write(const char *s)
   {
-    return write((uint8_t *)s, strlen(s));
+    return (s) ? write((uint8_t *)s, strlen(s)) : 0;
   }
 
   inline size_t write(unsigned long n)
@@ -74,6 +74,8 @@ public:
 
   virtual void   setDebugOutput(bool) = 0;
 
+
+  // Set buffer size, should be called before calling begin()
   virtual size_t setRxBufferSize(size_t new_size) = 0;
   virtual size_t setTxBufferSize(size_t new_size) = 0;
   virtual bool   setRS485Mode(int8_t rtsPin, bool enableCollisionDetection) = 0;