AT&T IoT / Mbed OS ATT_AWS_IoT_demo Featured

Demo application for using the AT&T IoT Starter Kit Powered by AWS.

Dependencies:   SDFileSystem

Fork of ATT_AWS_IoT_demo by Anthony Phillips

IoT Starter Kit Powered by AWS Demo

This program demonstrates the AT&T IoT Starter Kit sending data directly into AWS IoT. It's explained and used in the Getting Started with the IoT Starter Kit Powered by AWS on starterkit.att.com.

What's required

  • AT&T IoT LTE Add-on (also known as the Cellular Shield)
  • NXP K64F - for programming
  • microSD card - used to store your AWS security credentials
  • AWS account
  • Python, locally installed

If you don't already have an IoT Starter Kit, you can purchase a kit here. The IoT Starter Kit Powered by AWS includes the LTE cellular shield, K64F, and a microSD card.

Diff: main.cpp

Revision:
20:ee34856ae510
Parent:
18:6370da1de572
Child:
23:b9ff83dc965f
--- a/main.cpp	Tue Dec 06 22:45:00 2016 +0000
+++ b/main.cpp	Wed Dec 07 20:37:20 2016 +0000
@@ -21,6 +21,9 @@
 #include "aws_iot_config.h"
 #include "aws_iot_mqtt_interface.h"
 
+// Sensors
+#include "HTS221.h"
+
 #if DEBUG_LEVEL > 0
 #include "mbedtls/debug.h"
 #endif
@@ -67,6 +70,9 @@
  #define DEF
 #endif
 
+// Sensor defines
+#define CTOF(x)  ((x)*1.8+32) // Temperature
+
 //=====================================================================================================================
 //
 // Globals
@@ -89,6 +95,10 @@
 char PortString[5] = "8883";
 uint32_t port = AWS_IOT_MQTT_PORT;
 
+// Sensor data
+float temperature = 0.0;
+int   humidity    = 0;
+
 //=====================================================================================================================
 //
 // Devices
@@ -105,6 +115,9 @@
 // SD card access (MOSI, MISO, SCK, CS)
 SDFileSystem sd(PTE3, PTE1, PTE2, PTE4, "sd");
 
+// I2C bus (SDA, SCL)
+I2C i2c(PTC11, PTC10);
+
 //=====================================================================================================================
 //
 // Functions
@@ -216,8 +229,10 @@
     // Set baud rate for PC Serial
     pc.baud(115200);
     INFO("Hello World from AT&T IoT Start Kit demo!");
-                        
-    IoT_Error_t rc = NONE_ERROR;  
+              
+    int i;          
+    IoT_Error_t rc = NONE_ERROR;
+    HTS221 hts221;  // Temp/humidity  
     char JsonDocumentBuffer[MAX_LENGTH_OF_UPDATE_JSON_BUFFER];
     size_t sizeOfJsonDocumentBuffer = sizeof(JsonDocumentBuffer) / sizeof(JsonDocumentBuffer[0]);
 
@@ -228,15 +243,18 @@
     ledController.pKey = "ledColor";
     ledController.type = SHADOW_JSON_UINT8;
 
-    // TODO Add FRDM temperature reading
-    /*
-    float temperature = 0.0;
+    // JSON struct for temperature\humidity readings
     jsonStruct_t temperatureHandler;
     temperatureHandler.cb = NULL;
     temperatureHandler.pKey = "temperature";
     temperatureHandler.pData = &temperature;
     temperatureHandler.type = SHADOW_JSON_FLOAT;
-    */
+    
+    jsonStruct_t humidityHandler;
+    humidityHandler.cb = NULL;
+    humidityHandler.pKey = "humidity";
+    humidityHandler.pData = &humidity;
+    humidityHandler.type = SHADOW_JSON_INT16;
     
     INFO("AWS IoT SDK Version(dev) %d.%d.%d-%s", VERSION_MAJOR, VERSION_MINOR, VERSION_PATCH, VERSION_TAG);
 
@@ -261,6 +279,13 @@
     SetLedColor(COLOR_WHITE);
     wait(.5);
     SetLedColor(COLOR_OFF);
+    
+    // Initialize sensors
+    void hts221_init(void);
+    i = hts221.begin();  
+    if(!i) {
+        WARN(RED "HTS221 NOT DETECTED!!\n\r");
+    }
       
     // Setup SW3 button to falling edge interrupt
     Interrupt.fall(&sw3ButtonHandler);
@@ -285,7 +310,7 @@
     sp.pHost = HostAddress;
     sp.port = port;
 #endif
-
+          
     INFO("Initialize the MQTT client...");
     MQTTClient_t mqttClient;
     aws_iot_mqtt_init(&mqttClient);
@@ -335,7 +360,11 @@
             wait(1);
             continue;
         }
-                          
+        
+        // Read sensor data
+        temperature = CTOF(hts221.readTemperature());
+        humidity = hts221.readHumidity();
+                                
         INFO("\n=======================================================================================\n");             
         // Initialize JSON shadow document          
         rc = aws_iot_shadow_init_json_document(JsonDocumentBuffer, sizeOfJsonDocumentBuffer);
@@ -344,14 +373,19 @@
             // If there has been a SW3 button press update the 'desired' color
             if (buttonOverride) {
                 rc = aws_iot_shadow_add_desired(JsonDocumentBuffer, sizeOfJsonDocumentBuffer, 1, &ledController);
+                //rc = aws_iot_shadow_add_desired(JsonDocumentBuffer, sizeOfJsonDocumentBuffer, 3, &ledController,
+                //                                                                                 &temperatureHandler,
+                //                                                                                 &humidityHandler);
                 buttonOverride = false;
             }
                   
             // Updates the 'reported' color
-            rc = aws_iot_shadow_add_reported(JsonDocumentBuffer, sizeOfJsonDocumentBuffer, 1, &ledController);
+            //rc = aws_iot_shadow_add_reported(JsonDocumentBuffer, sizeOfJsonDocumentBuffer, 1, &ledController);
                 
             // TODO: format for adding temperature
-            //rc = aws_iot_shadow_add_reported(JsonDocumentBuffer, sizeOfJsonDocumentBuffer, 2, &ledController, &temperatureHandler);
+            rc = aws_iot_shadow_add_reported(JsonDocumentBuffer, sizeOfJsonDocumentBuffer, 3, &ledController,
+                                                                                              &temperatureHandler,
+                                                                                              &humidityHandler);
                  
             if (rc == NONE_ERROR) {               
                 rc = aws_iot_finalize_json_document(JsonDocumentBuffer, sizeOfJsonDocumentBuffer);   
@@ -362,9 +396,11 @@
                             ShadowUpdateStatusCallback, NULL, 8, true);
                 }
             }
-        }      
-                
-        // Set LED color then wait an loop again
+        }  
+        
+        // Print data    
+        INFO("Temperature is: %0.2f F", temperature);
+        INFO("Humidity    is: %02d", humidity);      
         switch (ledColor) {
              case COLOR_OFF:
                  INFO("LED: OFF");
@@ -383,7 +419,8 @@
                  break;
         }
         INFO("*****************************************************************************************");
-             
+         
+        // Set the LED color    
         SetLedColor(ledColor);
         wait(SHADOW_SYNC_INTERVAL);
     }