Add header file.

README.md

@@ -1,2 +1,6 @@
 # SerialMessenger
 Allows easy communication between two arduinos (or arduino like boards) via Serial or SoftwareSerial. 
+
+Limitations
+-----------
+- One function per channel (Why would you need more anyway?)

examples/HardwareSerial.ino

@@ -0,0 +1,21 @@
+#import <SerialMessenger.h>
+
+String channels[] = {
+  "Channel1",
+  "Channel2"
+};
+
+SerialMessenger messenger(channels);
+
+void setup() {
+  messenger.subscribe("Channel1", &channel1);
+  messenger.subscribe("Channel2", &channel1);
+}
+
+void loop() {
+  messenger.handle();
+}
+
+void channel1(String message) {
+  Serial.println(message);
+}

src/SerialMessenger.cpp

@@ -0,0 +1,24 @@
+#include <Arduino.h>
+#include <SerialMessenger.h>
+#include <vector>
+
+#ifdef SoftwareSerial_h
+#include <SoftwareSerial.h>
+#endif
+
+SerialMessenger::SerialMessenger() {}
+
+#ifdef SoftwareSerial_h
+SerialMessenger::SerialMessenger(SoftwareSerial * serial) {
+  _softSerial = serial;
+}
+#endif 
+
+SerialMessenger::subscribe(String channel, void(*func)(String)) {
+  int index = _channels.indexOf(channel);
+  _channelFunctions[index] = func;
+}
+
+SerialMessenger::publish(String channel, String message) {
+
+}

src/SerialMessenger.h

@@ -0,0 +1,35 @@
+/*
+  SerialMessenger.h - Easy Serial Communication for Arduino.
+  Created by Eric Mackrodt 2018.
+  Released into the public domain. MIT License.
+*/
+#ifndef SerialMessenger_h
+#define SerialMessenger_h
+
+#include "Arduino.h"
+
+#ifdef SoftwareSerial_h
+#include "SoftwareSerial.h"
+#endif
+
+class SerialMessenger
+{
+  public:
+    #ifdef SoftwareSerial_h
+    SerialMessenger(String channels[], SoftwareSerial * serial);
+    #endif
+    SerialMessenger(String channels[]);
+    void subscribe(String channel, void (*func)(String));
+    void send(String channel, String message);
+    void setPrefix(char prefix);
+    void setSuffix(char suffix);
+    void setDelimiter(char delimiter);
+    void handle();
+    ~SerialMessenger();
+  private:
+    String _channels[];
+    (void (*func)(String)) _channelFunctions[];
+    SoftwareSerial * _softSerial;
+};
+
+#endif