Create Hotdog script to interface between MQTT and the radio

HDPacketBuilder.h

@@ -0,0 +1,185 @@
+#include <CRC16.h>
+
+#define LENGTH_17                      (0x11)
+#define LENGTH_21                      (0x15)
+#define LENGTH_25                      (0x19)
+
+#define VERSION_5                      (0x05)
+#define VERSION_6                      (0x06)
+
+uint8_t rollingCode1 = 0xAC;
+uint8_t rollingCode2 = 0x82;
+
+uint8_t buf[32];
+
+CRC16 crc(0x755B, 0x0, 0xBA68, false, false);
+
+void setPacketLength(uint8_t);
+void setConstants();
+void setSourceRemoteAddress();
+void setHubSourceAddress();
+void setRollingCodes();
+void setProtocolVersion(uint8_t);
+void calculateCRC();
+
+
+void constructUpPacket()
+{
+  setPacketLength(LENGTH_17);
+  setConstants();
+  setSourceRemoteAddress();
+  setRollingCodes();
+  setProtocolVersion(VERSION_6);
+
+  buf[11] = 0x04; // Shade ID (group 4 for now)
+  buf[12] = 0x00; // Shade ID
+
+  buf[16] = 0x55; // Command
+  buf[17] = 0x00; // Empty?
+
+  calculateCRC();
+}
+
+void constructDownPacket()
+{
+  setPacketLength(LENGTH_17);
+  setConstants();
+  setSourceRemoteAddress();
+  setRollingCodes();
+  setProtocolVersion(VERSION_6);
+
+  buf[11] = 0x04; // Shade ID (group 4 for now)
+  buf[12] = 0x00; // Shade ID
+  
+  buf[16] = 0x44; // Command
+  buf[17] = 0x00; // Empty?
+
+  calculateCRC();
+}
+
+void constructStopPacket()
+{
+  setPacketLength(LENGTH_17);
+  setConstants();
+  setSourceRemoteAddress();
+  setRollingCodes();
+  setProtocolVersion(VERSION_6);
+
+  buf[11] = 0x04; // Shade ID (group 4 for now)
+  buf[12] = 0x00; // Shade ID
+
+  buf[16] = 0x53; // Command
+  buf[17] = 0x00; // Empty?
+
+  calculateCRC();
+}
+
+void constructPositionPacket(float percentage)
+{
+  setPacketLength(LENGTH_21);
+  setConstants();
+  setHubSourceAddress(); // TODO: Will this source address work?
+  setRollingCodes();
+  setProtocolVersion(VERSION_5);
+
+  buf[11] = 0x4E; // Shade ID?
+  buf[12] = 0xF1; // Shade ID?
+
+  buf[15] = 0x3F; // Command
+  buf[16] = 0x5A; // Empty?
+
+  buf[17] = 0x04; // Constant in this size packet?
+  buf[18] = 0x40; // Constant in this size packet?
+  buf[19] = 0x50; // Constant in this size packet?
+
+  uint16_t position = (uint16_t)(0xFFFF * percentage);
+
+  buf[20] = (uint8_t)(position & 0x00FF);
+  buf[21] = (uint8_t)((position & 0xFF00) >> 8);
+
+  calculateCRC();
+}
+
+void setPacketLength(uint8_t length) {
+  buf[0] = length;  // Packet size
+}
+
+void setConstants() {
+  buf[1] = 0x00;  // Constant?
+  buf[2] = 0x05;  // Constant?
+
+  buf[4] = 0xff;  // Constant?
+  buf[5] = 0xff;  // Constant?
+
+  buf[8] = 0x86;  // Constant?
+
+  buf[15] = 0x52; // Constant?
+}
+
+void setSourceRemoteAddress() {
+  buf[6] = 0x36;  // Source address?
+  buf[7] = 0x9e; // Source address?
+
+  buf[13] = 0x36; // Source address again?
+  buf[14] = 0x9e; // Source address again?
+}
+
+void setHubSourceAddress() {
+  buf[6] = 0x00;  // Source address?
+  buf[7] = 0x00; // Source address?
+
+  buf[13] = 0x00; // Source address again?
+  buf[14] = 0x00; // Source address again?
+}
+
+void setRollingCodes() {
+  buf[3] = rollingCode1;  // Rolling code 1
+  buf[10] = rollingCode2; // Rolling code 2
+}
+
+void setProtocolVersion(uint8_t version) {
+  buf[9] = version; // Protocol version?
+}
+
+void calculateCRC() { // must be called after the buffer has been filled
+  crc.restart();
+  uint8_t length = buf[0];
+  switch(length) {
+    case 0x11:
+      crc.setXorOut(0xBA68);
+      break;
+    case 0x15:
+      crc.setXorOut(0xE10C);
+      break;
+    case 0x19:
+      crc.setXorOut(0x89A0);
+      break;
+    default:
+      Serial.print("Unsupported length (");
+      Serial.print(length);
+      Serial.println("). Cannot calculate CRC");
+      return;
+  }
+  crc.add(buf, length + 1);
+  uint16_t result = crc.calc();
+  uint8_t checksum1 = (uint8_t)((result & 0xFF00) >> 8);
+  uint8_t checksum2 = (uint8_t)(result & 0x00FF);
+
+  buf[length + 1] = checksum1; // Checksum
+  buf[length + 2] = checksum2; // Checksum
+}
+
+void printHex(uint8_t num) {  //print a byte as two hex chars
+  char hexCar[3];
+  sprintf(hexCar, "%02X", num);
+  Serial.print(hexCar);
+}
+
+void printBuffer() //print a byte array as hex chars
+{
+  uint8_t bytecount = buf[0] + 3;
+  for (int i = 0; i < bytecount; i++) {
+    printHex(buf[i]);
+  }
+  Serial.println();
+}