Added an endpoint for toggling pin's value.

Proculite.GpioRest/Controllers/GpioController.cs

@@ -45,5 +45,13 @@ namespace Proculite.GpioRest.Controllers
 
             return Ok(_gpioService.SetPinLowReturning(pinNumber));
         }
+
+        [HttpPost("pin-value/toggle/{pinNumber}")]
+        public IActionResult TogglePin(int pinNumber)
+        {
+            if (!ModelState.IsValid)
+                return BadRequest();
+            return Ok(_gpioService.TogglePinReturning(pinNumber));
+        }
     }
 }

Proculite.GpioRest/Services/GpioService.cs

@@ -69,6 +69,13 @@ namespace Proculite.GpioRest.Services
             _gpioController.Write(pinNumber, PinValue.Low);
         }
 
+        public void TogglePin(int pinNumber)
+        {
+            PinValue currentValue = CurrentPinValue(pinNumber);
+            PinValue newValue = currentValue == PinValue.High ? PinValue.Low : PinValue.High;
+            _gpioController.Write(pinNumber, newValue);
+        }
+
         public PinValueModel SetPinHighReturning(int pinNumber)
         {
             SetPinHigh(pinNumber);
@@ -80,5 +87,11 @@ namespace Proculite.GpioRest.Services
             SetPinLow(pinNumber);
             return PinValueModelOfPin(pinNumber);
         }
+
+        public PinValueModel TogglePinReturning(int pinNumber)
+        {
+            TogglePin(pinNumber);
+            return PinValueModelOfPin(pinNumber);
+        }
     }
 }