diff --git a/examples/simple_sensor/SensorMesh.cpp b/examples/simple_sensor/SensorMesh.cpp
index 5966e928..ce36e0c2 100644
--- a/examples/simple_sensor/SensorMesh.cpp
+++ b/examples/simple_sensor/SensorMesh.cpp
@@ -547,7 +547,26 @@ void SensorMesh::handleCommand(uint32_t sender_timestamp, char* command, char* r
       Serial.printf("\n");
     }
     reply[0] = 0;
-  } else {
+  } else if (memcmp(command, "io ", 2) == 0) { // io {value}: write, io: read 
+    if (command[2] == ' ') { // it's a write
+      uint32_t val;
+      uint32_t g = board.getGpio();
+      if (command[3] == 'r') { // reset bits
+        sscanf(&command[4], "%x", &val);
+        val = g & ~val;    
+      } else if (command[3] == 's') { // set bits
+        sscanf(&command[4], "%x", &val);
+        val |= g;    
+      } else if (command[3] == 't') { // toggle bits
+        sscanf(&command[4], "%x", &val);
+        val ^= g;    
+      } else { // set value
+        sscanf(&command[3], "%x", &val);
+      }
+      board.setGpio(val);
+    }
+    sprintf(reply, "%x", board.getGpio());
+  } else{
     _cli.handleCommand(sender_timestamp, command, reply);  // common CLI commands
   }
 }
diff --git a/src/MeshCore.h b/src/MeshCore.h
index 98134e50..d8886136 100644
--- a/src/MeshCore.h
+++ b/src/MeshCore.h
@@ -41,6 +41,8 @@ public:
   virtual void onAfterTransmit() { }
   virtual void reboot() = 0;
   virtual void powerOff() { /* no op */ }
+  virtual uint32_t getGpio() { return 0; }
+  virtual void setGpio(uint32_t values) {}
   virtual uint8_t getStartupReason() const = 0;
   virtual bool startOTAUpdate(const char* id, char reply[]) { return false; }   // not supported
 };
diff --git a/variants/rak3x72/target.h b/variants/rak3x72/target.h
index 61e4747d..e0c1441e 100644
--- a/variants/rak3x72/target.h
+++ b/variants/rak3x72/target.h
@@ -13,6 +13,12 @@
 
 class RAK3x72Board : public STM32Board {
 public:
+    void begin() override {
+        STM32Board::begin();
+        pinMode(PA0, OUTPUT);
+        pinMode(PA1, OUTPUT);
+    }
+
     const char* getManufacturerName() const override {
         return "RAK 3x72";
     }
@@ -25,6 +31,17 @@ public:
         }
         return ((double)raw) * ADC_MULTIPLIER / 8 / 4096;
     }
+
+    void setGpio(uint32_t values) override {
+        // set led values
+        digitalWrite(PA0, values & 1);
+        digitalWrite(PA1, (values & 2) >> 1);
+    }
+
+    uint32_t getGpio() override {
+        // get led value
+        return (digitalRead(PA1) << 1) | digitalRead(PA0);
+    }
 };
 
 extern RAK3x72Board board;