Add interaction over Serial0

lib/comms/comms.h

@@ -0,0 +1,78 @@
+#ifndef __COMMS_H
+#define __COMMS_H
+
+#include <HardwareSerial.h>
+#include <config.h>
+
+enum MessageType
+{
+    SCAN = 0,
+    SCAN_RESULT,
+    _MAX_MESSAGE_TYPE = SCAN_RESULT
+};
+
+struct ScanTask
+{
+    int64_t count;
+    int64_t delay;
+};
+
+struct ScanTaskResult
+{
+    size_t sz;
+    uint32_t *freqs_khz;
+    int16_t *rssis;
+};
+
+struct Message
+{
+    MessageType type;
+    union
+    {
+        ScanTask scan;
+        ScanTaskResult dump;
+    } payload;
+};
+
+struct Comms
+{
+    Stream &serial;
+    Message **received;
+    size_t received_sz;
+    size_t received_pos;
+
+    Comms(Stream &serial)
+        : serial(serial), received(NULL), received_sz(0), received_pos(0) {};
+
+    virtual size_t available();
+    virtual bool send(Message &) = 0;
+    virtual Message *receive();
+
+    virtual void _onReceive() = 0;
+    virtual bool _messageArrived(Message &);
+
+    static bool initComms(Config &);
+};
+
+struct NoopComms : Comms
+{
+    NoopComms() : Comms(Serial0) {};
+
+    virtual bool send(Message &) { return true; };
+    virtual void _onReceive() {};
+};
+
+struct ReadlineComms : Comms
+{
+    String partialPacket;
+
+    ReadlineComms(Stream &serial) : Comms(serial), partialPacket("") {};
+
+    virtual bool send(Message &) override;
+
+    virtual void _onReceive() override;
+};
+
+extern Comms *Comms0;
+
+#endif