From 2e901ad709cc406121768cc813882dd83256ae68 Mon Sep 17 00:00:00 2001
From: Alexander Gabriel <alexander.gabriel@digital-infinity.de>
Date: Tue, 24 Nov 2020 22:47:19 +0100
Subject: [PATCH] TTN-Support

---
 .gitignore                   |  2 ++
 BME680-TTN.ino               | 54 +++++++++++++++++++++++++++++++++---
 TTN-configuration.template.h | 31 +++++++++++++++++++++
 decoder.js                   | 44 +++++++++++++++++++++++++++++
 4 files changed, 127 insertions(+), 4 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 TTN-configuration.template.h
 create mode 100644 decoder.js

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..01c7981
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.vscode
+TTN-configuration.h
\ No newline at end of file
diff --git a/BME680-TTN.ino b/BME680-TTN.ino
index f7d92de..28768ac 100644
--- a/BME680-TTN.ino
+++ b/BME680-TTN.ino
@@ -4,7 +4,6 @@
 
 #define USE_DISPLAY
 #ifdef USE_DISPLAY
-
 #include <U8g2lib.h>
 #ifdef U8X8_HAVE_HW_SPI
 #include <SPI.h>
@@ -14,14 +13,19 @@
 #endif
 
 #include <Adafruit_NeoPixel.h>
-#define LED_PIN 18
+#define LED_PIN 23
 #define LED_COUNT 8
 Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
 
-//U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 15, /* data=*/ 4, /* reset=*/ 16);
 U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 15, /* data=*/ 4, /* reset=*/ 16);
 #endif
 
+#include <SimpleLMIC.h>
+SimpleLMIC ttn;
+int TTNDebugLoopInterval = 1000;
+uint32_t TTNDebugLoopMillis = millis() - TTNDebugLoopInterval;
+int TTNSendLoopInterval = 10000;
+uint32_t TTNSendLoopMillis = millis() - TTNSendLoopInterval;
 
 int DisplayUpdateLoopInterval = 1000;
 uint32_t DisplayUpdateLoopMillis = millis() - DisplayUpdateLoopInterval;
@@ -72,11 +76,17 @@ void setup(void)
   strip.begin();
   strip.show();
   strip.setBrightness(50);
+
+  ttn.begin();
+  ttn.setSubBand(2);
+  ttn.onMessage(message);
+  ttn.join(devEui, appEui, appKey);
 }
 
 // Function that is looped forever
 void loop(void)
 {
+  ttn.loop();
   unsigned long time_trigger = millis();
   if (iaqSensor.run()) { // If new data is available
     output = String(time_trigger);
@@ -99,6 +109,18 @@ void loop(void)
   updateDisplay();
 #endif
   updateNeoPixel();
+
+  if (!ttn.isBusy() && ttn.isLink() && millis() - TTNSendLoopMillis > TTNSendLoopInterval)
+  {
+    TTNSendLoopMillis = millis();
+    Serial.println("Not Busy!");
+    Serial.println(iaqSensor.co2Equivalent);
+    Serial.println(sizeof(iaqSensor.co2Equivalent));
+    uint8_t buffer[sizeof(iaqSensor.co2Equivalent)];
+    ::memcpy(buffer, &iaqSensor.co2Equivalent, sizeof(iaqSensor.co2Equivalent));
+    ttn.write(buffer, sizeof(buffer));
+    ttn.send();
+  }
 }
 
 // Helper function definitions
@@ -168,6 +190,12 @@ void updateDisplay() {
     sprintf(displayText, "%20s", co2String);
     u8g2.drawStr(0,40,displayText);
 
+    sprintf(displayText, "ttn.isBusy(): %d", ttn.isBusy());
+    u8g2.drawStr(0,50,displayText);
+
+    sprintf(displayText, "ttn.isLink(): %d", ttn.isLink());
+    u8g2.drawStr(0,60,displayText);
+
     u8g2.sendBuffer();
   }
 }
@@ -192,4 +220,22 @@ void updateNeoPixel(){
         strip.show();
     }
   }
-}
\ No newline at end of file
+}
+
+void printTTNDebug() {
+  Serial.print("ttn.isBusy(): ");
+  Serial.print(ttn.isBusy());
+  Serial.print(" ttn.isLink(): ");
+  Serial.print(ttn.isLink());
+
+  Serial.println();
+}
+
+void message(uint8_t *payload, size_t size, uint8_t port)
+{
+  Serial.println("Received " + String(size) + " bytes on port " + String(port));
+  switch (port) {
+    case 1:
+      break;
+  }
+}
diff --git a/TTN-configuration.template.h b/TTN-configuration.template.h
new file mode 100644
index 0000000..f1a79d7
--- /dev/null
+++ b/TTN-configuration.template.h
@@ -0,0 +1,31 @@
+const char *devEui = "";
+const char *appEui = "";
+const char *appKey = "";
+
+//config for Arduino Due, GPS connected to Serial2... Don't ask...
+const lmic_pinmap lmic_pins = {
+   .nss = 10,
+   .rxtx = LMIC_UNUSED_PIN,
+   .rst = LMIC_UNUSED_PIN,
+   .dio = {2, 3, LMIC_UNUSED_PIN},
+};
+#define GPSSerial Serial2
+
+//Config for TTGO T-Beam T22 v1.1
+const lmic_pinmap lmic_pins = {
+   .nss = 18,
+   .rxtx = LMIC_UNUSED_PIN,
+   .rst = 23,
+   .dio = {26, 33, 32},
+};
+#define GPSSerial Serial1
+//#define GPS_RX_PIN 34
+//#define GPS_TX_PIN 12
+
+//Heltec Lora 32 v2
+const lmic_pinmap lmic_pins = {
+   .nss = 18,
+   .rxtx = LMIC_UNUSED_PIN,
+   .rst = 14,
+   .dio = {26, 34, 35},
+};
\ No newline at end of file
diff --git a/decoder.js b/decoder.js
new file mode 100644
index 0000000..ac3cf4b
--- /dev/null
+++ b/decoder.js
@@ -0,0 +1,44 @@
+function decodeFloat32(bytes) {
+  var sign = (bytes & 0x80000000) ? -1 : 1;
+  var exponent = ((bytes >> 23) & 0xFF) - 127;
+  var significand = (bytes & ~(-1 << 23));
+
+  if (exponent == 128)
+      return sign * ((significand) ? Number.NaN : Number.POSITIVE_INFINITY);
+
+  if (exponent == -127) {
+      if (significand == 0) return sign * 0.0;
+      exponent = -126;
+      significand /= (1 << 22);
+  } else significand = (significand | (1 << 23)) / (1 << 23);
+
+  return sign * significand * Math.pow(2, exponent);
+}
+
+function decodeInt16(bytes) {
+  if ((bytes & 1 << 15) > 0) { // value is negative (16bit 2's complement)
+      bytes = ((~bytes) & 0xffff) + 1; // invert 16bits & add 1 => now positive value
+      bytes = bytes * -1;
+  }
+  return bytes;
+}
+
+function int16_LE(bytes, idx) {
+  bytes = bytes.slice(idx || 0);
+  return bytes[0] << 0 | bytes[1] << 8;
+}
+
+function int32_LE(bytes, idx) {
+  bytes = bytes.slice(idx || 0);
+  return bytes[0] << 0 | bytes[1] << 8 | bytes[2] << 16 | bytes[3] << 24;
+}
+
+function Decoder(bytes, port) {
+  // Decode an uplink message from a buffer
+  // (array) of bytes to an object of fields.
+  var decoded = {
+      co2: decodeFloat32(int32_LE(bytes, 0)),
+  };
+
+  return decoded;
+}
\ No newline at end of file