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lib/hardware/hardware_serial.hpp

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+#pragma once
+#ifdef ESP32
+#include <HardwareSerial.h>
+typedef HardwareSerial SerialType;
+#define SERIAL_TYPE HardwareSerial
+#elif defined(ESP8266)
+#include <SoftwareSerial.h>
+typedef SoftwareSerial SerialType;
+#define SERIAL_TYPE SoftwareSerial
+#else
+#error "Unsupported platform. Only ESP32 and ESP8266 are supported."
+#endif
+
+#include <pb_encode.h>
+#include <pb_decode.h>
+#include "hardware.pb.h"
+
+// Define the role of this device
+// Uncomment one of the following defines to set the role
+//#define HARDWARE_SERIAL_ROLE_CONTROL
+#define HARDWARE_SERIAL_ROLE_SENSOR
+
+// Based on role, define the message types
+#if defined(HARDWARE_SERIAL_ROLE_CONTROL)
+typedef hardware_SensorToControlMessage IncomingMessage;
+typedef hardware_ControlToSensorMessage OutgoingMessage;
+#define INCOMING_MESSAGE_SIZE hardware_SensorToControlMessage_size
+#define OUTGOING_MESSAGE_SIZE hardware_ControlToSensorMessage_size
+#define INCOMING_MESSAGE_FIELDS hardware_SensorToControlMessage_fields
+#define OUTGOING_MESSAGE_FIELDS hardware_ControlToSensorMessage_fields
+#define INCOMING_MESSAGE_INIT hardware_SensorToControlMessage_init_default
+#define OUTGOING_MESSAGE_INIT hardware_ControlToSensorMessage_init_default
+#elif defined(HARDWARE_SERIAL_ROLE_SENSOR)
+typedef hardware_ControlToSensorMessage IncomingMessage;
+typedef hardware_SensorToControlMessage OutgoingMessage;
+#define INCOMING_MESSAGE_SIZE hardware_ControlToSensorMessage_size
+#define OUTGOING_MESSAGE_SIZE hardware_SensorToControlMessage_size
+#define INCOMING_MESSAGE_FIELDS hardware_ControlToSensorMessage_fields
+#define OUTGOING_MESSAGE_FIELDS hardware_SensorToControlMessage_fields
+#define INCOMING_MESSAGE_INIT hardware_ControlToSensorMessage_init_default
+#define OUTGOING_MESSAGE_INIT hardware_SensorToControlMessage_init_default
+#else
+#error "Must define either HARDWARE_SERIAL_ROLE_CONTROL or HARDWARE_SERIAL_ROLE_SENSOR"
+#endif
+
+class ProtoSerial {
+public:
+    ProtoSerial();
+    ~ProtoSerial();
+
+    // Initialize with RX and TX pins
+    void begin(int rxPin, int txPin, long baud = 9600);
+
+    // Send a message
+    bool sendMessage(const OutgoingMessage& message);
+
+    // Check for incoming messages (non-blocking)
+    void update();
+
+    // Check if a message has been received
+    bool hasMessage() const;
+
+    // Get the received message (only valid if hasMessage() returns true)
+    const IncomingMessage& getMessage() const;
+
+    // Clear the received message
+    void clearMessage();
+
+private:
+    SerialType* serial;
+    bool initialized;
+
+    // Receive state machine
+    enum RxState {
+        WAITING_FOR_LENGTH,
+        READING_PAYLOAD
+    };
+    RxState currentState;
+    uint16_t payloadLength;
+    uint8_t payloadBuffer[64]; // Max message size + some buffer
+    IncomingMessage receivedMessage;
+    bool messageAvailable;
+
+    // Helper methods
+    void processReceivedMessage(uint8_t* buffer, uint16_t length);
+};
+