Maxim Integrated / Mbed 2 deprecated DeepCover Embedded Security in IoT

MAXREFDES143#: DeepCover Embedded Security in IoT Authenticated Sensing & Notification

Dependencies:   MaximInterface mbed

The MAXREFDES143# is an Internet of Things (IoT) embedded security reference design, built to protect an industrial sensing node by means of authentication and notification to a web server. The hardware includes a peripheral module representing a protected sensor node monitoring operating temperature and remaining life of a filter (simulated through ambient light sensing) and an mbed shield representing a controller node responsible for monitoring one or more sensor nodes. The design is hierarchical with each controller node communicating data from connected sensor nodes to a web server that maintains a centralized log and dispatches notifications as necessary. The mbed shield contains a Wi-Fi module, a DS2465 coprocessor with 1-Wire® master function, an LCD, LEDs, and pushbuttons. The protected sensor node contains a DS28E15 authenticator, a DS7505 temperature sensor, and a MAX44009 light sensor. The mbed shield communicates to a web server by the onboard Wi-Fi module and to the protected sensor node with I2C and 1-Wire. The MAXREFDES143# is equipped with a standard shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The simplicity of this design enables rapid integration into any star-topology IoT network requiring the heightened security with low overhead provided by the SHA-256 symmetric-key algorithm.

More information about the MAXREFDES143# is available on the Maxim Integrated website.

main.cpp@28:e5cdaf13d299, 2017-01-26 (annotated)

Committer:
IanBenzMaxim
Date:
Thu Jan 26 14:18:21 2017 -0600
Revision:
28:e5cdaf13d299
Parent:
25:37ea43ff81be
Child:
29:590a7561318b
Migrated the web interface to the mbed 5 networking stack to improve system compatibility.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 1:e1c7c1c636af 1 /*******************************************************************************
IanBenzMaxim 1:e1c7c1c636af 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
IanBenzMaxim 1:e1c7c1c636af 3 *
IanBenzMaxim 1:e1c7c1c636af 4 * Permission is hereby granted, free of charge, to any person obtaining a
IanBenzMaxim 1:e1c7c1c636af 5 * copy of this software and associated documentation files (the "Software"),
IanBenzMaxim 1:e1c7c1c636af 6 * to deal in the Software without restriction, including without limitation
IanBenzMaxim 1:e1c7c1c636af 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
IanBenzMaxim 1:e1c7c1c636af 8 * and/or sell copies of the Software, and to permit persons to whom the
IanBenzMaxim 1:e1c7c1c636af 9 * Software is furnished to do so, subject to the following conditions:
IanBenzMaxim 1:e1c7c1c636af 10 *
IanBenzMaxim 1:e1c7c1c636af 11 * The above copyright notice and this permission notice shall be included
IanBenzMaxim 1:e1c7c1c636af 12 * in all copies or substantial portions of the Software.
IanBenzMaxim 1:e1c7c1c636af 13 *
IanBenzMaxim 1:e1c7c1c636af 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
IanBenzMaxim 1:e1c7c1c636af 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
IanBenzMaxim 1:e1c7c1c636af 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IanBenzMaxim 1:e1c7c1c636af 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
IanBenzMaxim 1:e1c7c1c636af 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
IanBenzMaxim 1:e1c7c1c636af 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
IanBenzMaxim 1:e1c7c1c636af 20 * OTHER DEALINGS IN THE SOFTWARE.
IanBenzMaxim 1:e1c7c1c636af 21 *
IanBenzMaxim 1:e1c7c1c636af 22 * Except as contained in this notice, the name of Maxim Integrated
IanBenzMaxim 1:e1c7c1c636af 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
IanBenzMaxim 1:e1c7c1c636af 24 * Products, Inc. Branding Policy.
IanBenzMaxim 1:e1c7c1c636af 25 *
IanBenzMaxim 1:e1c7c1c636af 26 * The mere transfer of this software does not imply any licenses
IanBenzMaxim 1:e1c7c1c636af 27 * of trade secrets, proprietary technology, copyrights, patents,
IanBenzMaxim 1:e1c7c1c636af 28 * trademarks, maskwork rights, or any other form of intellectual
IanBenzMaxim 1:e1c7c1c636af 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
IanBenzMaxim 1:e1c7c1c636af 30 * ownership rights.
IanBenzMaxim 1:e1c7c1c636af 31 *******************************************************************************
IanBenzMaxim 1:e1c7c1c636af 32 */
IanBenzMaxim 1:e1c7c1c636af 33
IanBenzMaxim 1:e1c7c1c636af 34 #include <sstream>
IanBenzMaxim 1:e1c7c1c636af 35
IanBenzMaxim 25:37ea43ff81be 36 #include "SensorData.hpp"
IanBenzMaxim 1:e1c7c1c636af 37 #include "WebServerInterface.hpp"
IanBenzMaxim 1:e1c7c1c636af 38 #include "Factory.hpp"
IanBenzMaxim 1:e1c7c1c636af 39 #include "SensorNode.hpp"
IanBenzMaxim 6:b6bafd0a7013 40 #include "Masters/DS2465/DS2465.h"
IanBenzMaxim 1:e1c7c1c636af 41 #include "Display.hpp"
IanBenzMaxim 17:41be4896ed6d 42 #include "RomId/RomId.h"
IanBenzMaxim 28:e5cdaf13d299 43 #include "ESP8266Interface.h"
IanBenzMaxim 1:e1c7c1c636af 44 #include "mbed.h"
IanBenzMaxim 1:e1c7c1c636af 45
IanBenzMaxim 6:b6bafd0a7013 46 using OneWire::RomId;
IanBenzMaxim 8:594529956266 47 using OneWire::DS2465;
IanBenzMaxim 6:b6bafd0a7013 48
IanBenzMaxim 1:e1c7c1c636af 49 /// Main status for the program.
IanBenzMaxim 1:e1c7c1c636af 50 enum Status
IanBenzMaxim 1:e1c7c1c636af 51 {
IanBenzMaxim 1:e1c7c1c636af 52 InitializingController, ///< Configure DS2465 and connect to network.
IanBenzMaxim 1:e1c7c1c636af 53 DisplaySessionId, ///< Display ID for use with website.
IanBenzMaxim 1:e1c7c1c636af 54 SensorNodeNeedsDetection, ///< Prompt user to insert Sensor Node.
IanBenzMaxim 1:e1c7c1c636af 55 DetectingSensorNode, ///< Check if Sensor Node present.
IanBenzMaxim 1:e1c7c1c636af 56 SensorNodeNeedsProvision, ///< Sensor Node needs to be provisioned.
IanBenzMaxim 1:e1c7c1c636af 57 ProvisioningSensorNode, ///< Provisioning Sensor Node to factory defaults.
IanBenzMaxim 1:e1c7c1c636af 58 NormalOperation, ///< The normal demo operation state.
IanBenzMaxim 1:e1c7c1c636af 59 SensorNodeNotAuthentic, ///< Sensor Node failed authentication check.
IanBenzMaxim 1:e1c7c1c636af 60 ControllerInitializationError, ///< Failed to initialize Controller.
IanBenzMaxim 1:e1c7c1c636af 61 ControllerHardwareError, ///< Controller hardware failed unexpectedly.
IanBenzMaxim 1:e1c7c1c636af 62 SensorNodeHardwareError ///< Sensor Node hardware failed unexpectedly.
IanBenzMaxim 1:e1c7c1c636af 63 };
IanBenzMaxim 1:e1c7c1c636af 64
IanBenzMaxim 1:e1c7c1c636af 65 /// @{
IanBenzMaxim 1:e1c7c1c636af 66 /// Configuration options.
IanBenzMaxim 1:e1c7c1c636af 67 static const unsigned int webPostIntervalMs = 10000;
IanBenzMaxim 1:e1c7c1c636af 68 static const unsigned int webPostRetryIntervalMs = 1000;
IanBenzMaxim 6:b6bafd0a7013 69 static const uint8_t maxConsecutiveWebPostErrors = 3;
IanBenzMaxim 1:e1c7c1c636af 70 /// @}
IanBenzMaxim 1:e1c7c1c636af 71
IanBenzMaxim 1:e1c7c1c636af 72 /// @{
IanBenzMaxim 1:e1c7c1c636af 73 /// LCD display colors.
IanBenzMaxim 25:37ea43ff81be 74 static const Display::Color Teal = { 0x00, 0xB2, 0xA9 };
IanBenzMaxim 25:37ea43ff81be 75 static const Display::Color Red = { 0xFF, 0x00, 0x00 };
IanBenzMaxim 25:37ea43ff81be 76 static const Display::Color Green = { 0x00, 0xFF, 0x00 };
IanBenzMaxim 25:37ea43ff81be 77 static const Display::Color Purple = { 0x6E, 0x25, 0x85 };
IanBenzMaxim 1:e1c7c1c636af 78 /// @}
IanBenzMaxim 1:e1c7c1c636af 79
IanBenzMaxim 28:e5cdaf13d299 80 static const char wifiSsid[] = "TWS iPhone";
IanBenzMaxim 28:e5cdaf13d299 81 static const char wifiPassword[] = "maxim1234";
IanBenzMaxim 28:e5cdaf13d299 82
IanBenzMaxim 1:e1c7c1c636af 83 /// @{
IanBenzMaxim 1:e1c7c1c636af 84 /// Peripheral and pin definitions
IanBenzMaxim 1:e1c7c1c636af 85 static Serial pc(USBTX, USBRX);
IanBenzMaxim 19:b8b0cd35f7b4 86 static DigitalIn provisionButton(D13);
IanBenzMaxim 19:b8b0cd35f7b4 87 static DigitalIn invalidateButton(D5);
IanBenzMaxim 19:b8b0cd35f7b4 88 static DigitalOut tempAlarmLed(D11, 1);
IanBenzMaxim 19:b8b0cd35f7b4 89 static DigitalOut filterLifeAlarmLed(D10, 1);
IanBenzMaxim 19:b8b0cd35f7b4 90 static I2C i2c(D14, D15);
IanBenzMaxim 1:e1c7c1c636af 91 static Display lcd(i2c, 0x78, 0x98);
IanBenzMaxim 1:e1c7c1c636af 92 static DS2465 ds2465(i2c, 0x30);
IanBenzMaxim 1:e1c7c1c636af 93 static SensorNode sensorNode(i2c, 0x90, 0x94, ds2465);
IanBenzMaxim 28:e5cdaf13d299 94 static ESP8266Interface esp8266(D1, D0, true);
IanBenzMaxim 28:e5cdaf13d299 95 static DigitalOut esp8266_RST(D2, 0);
IanBenzMaxim 28:e5cdaf13d299 96 static DigitalOut esp8266_CH_PD(D3, 1);
IanBenzMaxim 28:e5cdaf13d299 97 static WebServerInterface webIntf(esp8266);
IanBenzMaxim 1:e1c7c1c636af 98 /// @}
IanBenzMaxim 1:e1c7c1c636af 99
IanBenzMaxim 1:e1c7c1c636af 100 static bool useInvalidSecret = false; ///< Imitate an invalid controller when posting to web server.
IanBenzMaxim 1:e1c7c1c636af 101 static unsigned int randomSeed = 0; ///< Create extra entropy for challenge.
IanBenzMaxim 1:e1c7c1c636af 102 static Status currentStatus = InitializingController;
IanBenzMaxim 1:e1c7c1c636af 103 static bool result = false;
IanBenzMaxim 6:b6bafd0a7013 104 static uint8_t consecutiveWebPostErrors = 0; ///< Account for a few network errors in case of flaky connection.
IanBenzMaxim 1:e1c7c1c636af 105 static Timer webPostTimer; ///< Software timer to track web posting interval.
IanBenzMaxim 5:63232ef22abe 106 static Timer retryTimer; ///< Software timer to track authentication retries.
IanBenzMaxim 1:e1c7c1c636af 107
IanBenzMaxim 1:e1c7c1c636af 108 static void blinkLeds(unsigned int time_ms); ///< Invert LEDs for a given amount of time.
IanBenzMaxim 1:e1c7c1c636af 109 static bool buttonPressed(DigitalIn & button); ///< Checks if button is pressed (returns true) and waits for release.
IanBenzMaxim 1:e1c7c1c636af 110 static void displayStatus(Status status); ///< Display status message on LCD.
IanBenzMaxim 1:e1c7c1c636af 111 static void displaySensorData(const SensorData & sensorData); ///< Display sensor data on the LCD.
IanBenzMaxim 25:37ea43ff81be 112 static bool readWebSessionId(OneWire::RomId & sessionId); ///< Read device's web session ID from it's nonvolatile storage.
IanBenzMaxim 1:e1c7c1c636af 113
IanBenzMaxim 1:e1c7c1c636af 114 #ifdef ASSEMBLY_TEST
IanBenzMaxim 1:e1c7c1c636af 115 #include "AssemblyTest.cpp"
IanBenzMaxim 1:e1c7c1c636af 116 #endif
IanBenzMaxim 1:e1c7c1c636af 117
IanBenzMaxim 1:e1c7c1c636af 118 int main()
IanBenzMaxim 1:e1c7c1c636af 119 {
IanBenzMaxim 1:e1c7c1c636af 120 blinkLeds(500);
IanBenzMaxim 1:e1c7c1c636af 121
IanBenzMaxim 1:e1c7c1c636af 122 #ifdef ASSEMBLY_TEST
IanBenzMaxim 1:e1c7c1c636af 123 assemblyTest();
IanBenzMaxim 1:e1c7c1c636af 124 #endif
IanBenzMaxim 1:e1c7c1c636af 125
IanBenzMaxim 1:e1c7c1c636af 126 while (true)
IanBenzMaxim 1:e1c7c1c636af 127 {
IanBenzMaxim 1:e1c7c1c636af 128 Status nextStatus = currentStatus;
IanBenzMaxim 1:e1c7c1c636af 129 switch (currentStatus)
IanBenzMaxim 1:e1c7c1c636af 130 {
IanBenzMaxim 1:e1c7c1c636af 131 case InitializingController:
IanBenzMaxim 1:e1c7c1c636af 132 pc.baud(115200);
IanBenzMaxim 1:e1c7c1c636af 133 i2c.frequency(100000);
IanBenzMaxim 1:e1c7c1c636af 134 webPostTimer.start();
IanBenzMaxim 1:e1c7c1c636af 135
IanBenzMaxim 1:e1c7c1c636af 136 // Set initial LCD state
IanBenzMaxim 1:e1c7c1c636af 137 lcd.initialize();
IanBenzMaxim 1:e1c7c1c636af 138 displayStatus(currentStatus);
IanBenzMaxim 1:e1c7c1c636af 139
IanBenzMaxim 1:e1c7c1c636af 140 // Connect to Wifi network
IanBenzMaxim 28:e5cdaf13d299 141 esp8266_RST = 1;
IanBenzMaxim 28:e5cdaf13d299 142 result = (esp8266.connect(wifiSsid, wifiPassword, NSAPI_SECURITY_WPA2) == 0);
IanBenzMaxim 1:e1c7c1c636af 143
IanBenzMaxim 1:e1c7c1c636af 144 // Read session ID
IanBenzMaxim 1:e1c7c1c636af 145 if (result)
IanBenzMaxim 1:e1c7c1c636af 146 {
IanBenzMaxim 25:37ea43ff81be 147 OneWire::RomId sessionId;
IanBenzMaxim 25:37ea43ff81be 148 result = readWebSessionId(sessionId);
IanBenzMaxim 25:37ea43ff81be 149 if (result)
IanBenzMaxim 25:37ea43ff81be 150 {
IanBenzMaxim 25:37ea43ff81be 151 webIntf.setSessionId(sessionId);
IanBenzMaxim 25:37ea43ff81be 152 }
IanBenzMaxim 1:e1c7c1c636af 153 }
IanBenzMaxim 1:e1c7c1c636af 154
IanBenzMaxim 1:e1c7c1c636af 155 // Provision DS2465 with master secret and page data
IanBenzMaxim 1:e1c7c1c636af 156 if (result)
IanBenzMaxim 1:e1c7c1c636af 157 {
IanBenzMaxim 25:37ea43ff81be 158 result = provisionCoprocessor(ds2465);
IanBenzMaxim 1:e1c7c1c636af 159 }
IanBenzMaxim 1:e1c7c1c636af 160
IanBenzMaxim 1:e1c7c1c636af 161 if (result)
IanBenzMaxim 1:e1c7c1c636af 162 {
IanBenzMaxim 1:e1c7c1c636af 163 nextStatus = DisplaySessionId;
IanBenzMaxim 1:e1c7c1c636af 164 }
IanBenzMaxim 1:e1c7c1c636af 165 else
IanBenzMaxim 1:e1c7c1c636af 166 {
IanBenzMaxim 1:e1c7c1c636af 167 nextStatus = ControllerInitializationError;
IanBenzMaxim 1:e1c7c1c636af 168 }
IanBenzMaxim 1:e1c7c1c636af 169 break;
IanBenzMaxim 1:e1c7c1c636af 170
IanBenzMaxim 1:e1c7c1c636af 171 case DisplaySessionId:
IanBenzMaxim 1:e1c7c1c636af 172 // Wait for user to press Provision button
IanBenzMaxim 1:e1c7c1c636af 173 if (buttonPressed(provisionButton))
IanBenzMaxim 1:e1c7c1c636af 174 {
IanBenzMaxim 1:e1c7c1c636af 175 nextStatus = SensorNodeNeedsDetection;
IanBenzMaxim 1:e1c7c1c636af 176 }
IanBenzMaxim 1:e1c7c1c636af 177 break;
IanBenzMaxim 1:e1c7c1c636af 178
IanBenzMaxim 1:e1c7c1c636af 179 case SensorNodeNeedsDetection:
IanBenzMaxim 1:e1c7c1c636af 180 // Wait for user to press Provision button
IanBenzMaxim 1:e1c7c1c636af 181 if (buttonPressed(provisionButton))
IanBenzMaxim 1:e1c7c1c636af 182 {
IanBenzMaxim 1:e1c7c1c636af 183 nextStatus = DetectingSensorNode;
IanBenzMaxim 1:e1c7c1c636af 184 }
IanBenzMaxim 1:e1c7c1c636af 185 break;
IanBenzMaxim 1:e1c7c1c636af 186
IanBenzMaxim 1:e1c7c1c636af 187 case DetectingSensorNode:
IanBenzMaxim 1:e1c7c1c636af 188 // Perform Sensor Node detection sequence
IanBenzMaxim 1:e1c7c1c636af 189 switch (sensorNode.detect(randomSeed))
IanBenzMaxim 1:e1c7c1c636af 190 {
IanBenzMaxim 1:e1c7c1c636af 191 case SensorNode::UnableToCommunicate:
IanBenzMaxim 1:e1c7c1c636af 192 default:
IanBenzMaxim 1:e1c7c1c636af 193 nextStatus = SensorNodeHardwareError;
IanBenzMaxim 1:e1c7c1c636af 194 break;
IanBenzMaxim 1:e1c7c1c636af 195
IanBenzMaxim 1:e1c7c1c636af 196 case SensorNode::NotProvisioned:
IanBenzMaxim 1:e1c7c1c636af 197 nextStatus = SensorNodeNeedsProvision;
IanBenzMaxim 1:e1c7c1c636af 198 break;
IanBenzMaxim 1:e1c7c1c636af 199
IanBenzMaxim 1:e1c7c1c636af 200 case SensorNode::NotAuthentic:
IanBenzMaxim 1:e1c7c1c636af 201 nextStatus = SensorNodeNotAuthentic;
IanBenzMaxim 1:e1c7c1c636af 202 break;
IanBenzMaxim 1:e1c7c1c636af 203
IanBenzMaxim 1:e1c7c1c636af 204 case SensorNode::Authentic:
IanBenzMaxim 1:e1c7c1c636af 205 nextStatus = NormalOperation;
IanBenzMaxim 1:e1c7c1c636af 206 break;
IanBenzMaxim 1:e1c7c1c636af 207 }
IanBenzMaxim 1:e1c7c1c636af 208 break;
IanBenzMaxim 1:e1c7c1c636af 209
IanBenzMaxim 1:e1c7c1c636af 210 case SensorNodeNeedsProvision:
IanBenzMaxim 1:e1c7c1c636af 211 // Wait for user to press Provision button
IanBenzMaxim 1:e1c7c1c636af 212 if (buttonPressed(provisionButton))
IanBenzMaxim 1:e1c7c1c636af 213 {
IanBenzMaxim 1:e1c7c1c636af 214 nextStatus = ProvisioningSensorNode;
IanBenzMaxim 1:e1c7c1c636af 215 }
IanBenzMaxim 1:e1c7c1c636af 216 break;
IanBenzMaxim 1:e1c7c1c636af 217
IanBenzMaxim 1:e1c7c1c636af 218 case ProvisioningSensorNode:
IanBenzMaxim 1:e1c7c1c636af 219 if (!buttonPressed(invalidateButton)) // Provision normally
IanBenzMaxim 1:e1c7c1c636af 220 {
IanBenzMaxim 25:37ea43ff81be 221 if (provisionSensorNode(sensorNode, true))
IanBenzMaxim 1:e1c7c1c636af 222 {
IanBenzMaxim 1:e1c7c1c636af 223 nextStatus = NormalOperation;
IanBenzMaxim 1:e1c7c1c636af 224 }
IanBenzMaxim 1:e1c7c1c636af 225 else
IanBenzMaxim 1:e1c7c1c636af 226 {
IanBenzMaxim 1:e1c7c1c636af 227 nextStatus = SensorNodeNotAuthentic;
IanBenzMaxim 1:e1c7c1c636af 228 }
IanBenzMaxim 1:e1c7c1c636af 229 }
IanBenzMaxim 1:e1c7c1c636af 230 else // Invalidate button also pressed; Load invalid secret
IanBenzMaxim 1:e1c7c1c636af 231 {
IanBenzMaxim 1:e1c7c1c636af 232 // Provision with invalid secret
IanBenzMaxim 25:37ea43ff81be 233 if (provisionSensorNode(sensorNode, false))
IanBenzMaxim 1:e1c7c1c636af 234 {
IanBenzMaxim 1:e1c7c1c636af 235 nextStatus = NormalOperation;
IanBenzMaxim 1:e1c7c1c636af 236 }
IanBenzMaxim 1:e1c7c1c636af 237 else
IanBenzMaxim 1:e1c7c1c636af 238 {
IanBenzMaxim 1:e1c7c1c636af 239 nextStatus = SensorNodeHardwareError;
IanBenzMaxim 1:e1c7c1c636af 240 }
IanBenzMaxim 1:e1c7c1c636af 241 }
IanBenzMaxim 1:e1c7c1c636af 242 break;
IanBenzMaxim 1:e1c7c1c636af 243
IanBenzMaxim 1:e1c7c1c636af 244 case NormalOperation:
IanBenzMaxim 1:e1c7c1c636af 245 // Check if user pressed Provision button
IanBenzMaxim 1:e1c7c1c636af 246 if (buttonPressed(provisionButton))
IanBenzMaxim 1:e1c7c1c636af 247 {
IanBenzMaxim 1:e1c7c1c636af 248 // Re-provision Sensor Node
IanBenzMaxim 1:e1c7c1c636af 249 nextStatus = ProvisioningSensorNode;
IanBenzMaxim 1:e1c7c1c636af 250 }
IanBenzMaxim 1:e1c7c1c636af 251 // Check if user pressed Invalidate button
IanBenzMaxim 1:e1c7c1c636af 252 else if (buttonPressed(invalidateButton))
IanBenzMaxim 1:e1c7c1c636af 253 {
IanBenzMaxim 1:e1c7c1c636af 254 // Toggle between using valid and invalid secret
IanBenzMaxim 1:e1c7c1c636af 255 // 1 blink = invalid; 2 blinks = valid
IanBenzMaxim 1:e1c7c1c636af 256 useInvalidSecret = !useInvalidSecret;
IanBenzMaxim 1:e1c7c1c636af 257 blinkLeds(100);
IanBenzMaxim 1:e1c7c1c636af 258 if (!useInvalidSecret)
IanBenzMaxim 1:e1c7c1c636af 259 {
IanBenzMaxim 1:e1c7c1c636af 260 wait_ms(100);
IanBenzMaxim 1:e1c7c1c636af 261 blinkLeds(100);
IanBenzMaxim 1:e1c7c1c636af 262 }
IanBenzMaxim 1:e1c7c1c636af 263 }
IanBenzMaxim 1:e1c7c1c636af 264 // Check node and display measurements
IanBenzMaxim 1:e1c7c1c636af 265 else
IanBenzMaxim 1:e1c7c1c636af 266 {
IanBenzMaxim 1:e1c7c1c636af 267 SensorData sensorData;
IanBenzMaxim 1:e1c7c1c636af 268 // Read sensor data with authentication
IanBenzMaxim 1:e1c7c1c636af 269 switch (sensorNode.authenticatedReadSensorData(randomSeed, sensorData))
IanBenzMaxim 1:e1c7c1c636af 270 {
IanBenzMaxim 1:e1c7c1c636af 271 case SensorNode::Authentic:
IanBenzMaxim 1:e1c7c1c636af 272 // Update measurements on LCD
IanBenzMaxim 1:e1c7c1c636af 273 displaySensorData(sensorData);
IanBenzMaxim 1:e1c7c1c636af 274
IanBenzMaxim 1:e1c7c1c636af 275 // Update alarm LEDs
IanBenzMaxim 1:e1c7c1c636af 276 tempAlarmLed = !sensorData.tempAlarm(); // Active Low
IanBenzMaxim 1:e1c7c1c636af 277 filterLifeAlarmLed = !sensorData.filterLifeAlarm(); // Active Low
IanBenzMaxim 1:e1c7c1c636af 278
IanBenzMaxim 1:e1c7c1c636af 279 // Send measurements to web if time interval reached
IanBenzMaxim 20:cdba71cb5506 280 if (static_cast<unsigned int>(webPostTimer.read_ms()) >= webPostIntervalMs)
IanBenzMaxim 1:e1c7c1c636af 281 {
IanBenzMaxim 1:e1c7c1c636af 282 // Format, sign, and transmit data to web server
IanBenzMaxim 1:e1c7c1c636af 283 result = webIntf.authPostHttpEvent(ds2465, SensorDataEvent, WebServerInterface::formatSensorDataPostBody(sensorData), !useInvalidSecret);
IanBenzMaxim 1:e1c7c1c636af 284 if (result)
IanBenzMaxim 1:e1c7c1c636af 285 {
IanBenzMaxim 1:e1c7c1c636af 286 // Reset timer count after logging sample complete
IanBenzMaxim 1:e1c7c1c636af 287 webPostTimer.reset();
IanBenzMaxim 1:e1c7c1c636af 288 consecutiveWebPostErrors = 0;
IanBenzMaxim 1:e1c7c1c636af 289 }
IanBenzMaxim 1:e1c7c1c636af 290 // There was likely an error establishing a web connection
IanBenzMaxim 1:e1c7c1c636af 291 else if (++consecutiveWebPostErrors < maxConsecutiveWebPostErrors)
IanBenzMaxim 1:e1c7c1c636af 292 {
IanBenzMaxim 1:e1c7c1c636af 293 // Wait and try again
IanBenzMaxim 1:e1c7c1c636af 294 wait_ms(webPostRetryIntervalMs);
IanBenzMaxim 1:e1c7c1c636af 295 }
IanBenzMaxim 1:e1c7c1c636af 296 // Too many retry attempts
IanBenzMaxim 1:e1c7c1c636af 297 else
IanBenzMaxim 1:e1c7c1c636af 298 {
IanBenzMaxim 1:e1c7c1c636af 299 // Assume we have lost network connection
IanBenzMaxim 1:e1c7c1c636af 300 nextStatus = ControllerHardwareError;
IanBenzMaxim 1:e1c7c1c636af 301 }
IanBenzMaxim 1:e1c7c1c636af 302 }
IanBenzMaxim 1:e1c7c1c636af 303 break;
IanBenzMaxim 1:e1c7c1c636af 304
IanBenzMaxim 1:e1c7c1c636af 305 case SensorNode::NotAuthentic:
IanBenzMaxim 1:e1c7c1c636af 306 nextStatus = SensorNodeNotAuthentic;
IanBenzMaxim 1:e1c7c1c636af 307 break;
IanBenzMaxim 1:e1c7c1c636af 308
IanBenzMaxim 1:e1c7c1c636af 309 case SensorNode::UnableToCommunicate:
IanBenzMaxim 1:e1c7c1c636af 310 default:
IanBenzMaxim 1:e1c7c1c636af 311 nextStatus = SensorNodeHardwareError;
IanBenzMaxim 1:e1c7c1c636af 312 break;
IanBenzMaxim 1:e1c7c1c636af 313 }
IanBenzMaxim 1:e1c7c1c636af 314 }
IanBenzMaxim 1:e1c7c1c636af 315 break;
IanBenzMaxim 1:e1c7c1c636af 316
IanBenzMaxim 1:e1c7c1c636af 317 case SensorNodeNotAuthentic:
IanBenzMaxim 5:63232ef22abe 318 // Wait for some time before retrying authentication
IanBenzMaxim 5:63232ef22abe 319 retryTimer.reset();
IanBenzMaxim 5:63232ef22abe 320 retryTimer.start();
IanBenzMaxim 5:63232ef22abe 321 do
IanBenzMaxim 1:e1c7c1c636af 322 {
IanBenzMaxim 5:63232ef22abe 323 // Wait for user to press Provision button
IanBenzMaxim 5:63232ef22abe 324 if (buttonPressed(provisionButton))
IanBenzMaxim 5:63232ef22abe 325 {
IanBenzMaxim 5:63232ef22abe 326 nextStatus = ProvisioningSensorNode;
IanBenzMaxim 5:63232ef22abe 327 break;
IanBenzMaxim 5:63232ef22abe 328 }
IanBenzMaxim 5:63232ef22abe 329 // Try to authenticate and return to normal operation
IanBenzMaxim 20:cdba71cb5506 330 else if (static_cast<unsigned int>(webPostTimer.read_ms()) >= webPostIntervalMs)
IanBenzMaxim 1:e1c7c1c636af 331 {
IanBenzMaxim 5:63232ef22abe 332 // Send event message to server
IanBenzMaxim 5:63232ef22abe 333 result = webIntf.authPostHttpEvent(ds2465, InvalidSensorEvent, "", !useInvalidSecret);
IanBenzMaxim 5:63232ef22abe 334 if (result)
IanBenzMaxim 5:63232ef22abe 335 {
IanBenzMaxim 5:63232ef22abe 336 // Reset timer count after logging complete
IanBenzMaxim 5:63232ef22abe 337 webPostTimer.reset();
IanBenzMaxim 5:63232ef22abe 338 consecutiveWebPostErrors = 0;
IanBenzMaxim 5:63232ef22abe 339
IanBenzMaxim 5:63232ef22abe 340 // Try to authenticate again
IanBenzMaxim 5:63232ef22abe 341 nextStatus = SensorNodeNeedsDetection;
IanBenzMaxim 5:63232ef22abe 342 }
IanBenzMaxim 5:63232ef22abe 343 else if (++consecutiveWebPostErrors < maxConsecutiveWebPostErrors)
IanBenzMaxim 5:63232ef22abe 344 {
IanBenzMaxim 5:63232ef22abe 345 // There was likely an error establishing a web connection
IanBenzMaxim 5:63232ef22abe 346 // Wait and try again
IanBenzMaxim 5:63232ef22abe 347 wait_ms(webPostRetryIntervalMs);
IanBenzMaxim 5:63232ef22abe 348 }
IanBenzMaxim 15:8cc4cdea59da 349 // Too many retry attempts
IanBenzMaxim 5:63232ef22abe 350 else
IanBenzMaxim 5:63232ef22abe 351 {
IanBenzMaxim 15:8cc4cdea59da 352 // Assume we have lost network connection
IanBenzMaxim 5:63232ef22abe 353 nextStatus = ControllerHardwareError;
IanBenzMaxim 5:63232ef22abe 354 break;
IanBenzMaxim 5:63232ef22abe 355 }
IanBenzMaxim 1:e1c7c1c636af 356 }
IanBenzMaxim 20:cdba71cb5506 357 } while (static_cast<unsigned int>(retryTimer.read_ms()) < webPostIntervalMs);
IanBenzMaxim 5:63232ef22abe 358 retryTimer.stop();
IanBenzMaxim 1:e1c7c1c636af 359 break;
IanBenzMaxim 1:e1c7c1c636af 360
IanBenzMaxim 1:e1c7c1c636af 361 case ControllerInitializationError:
IanBenzMaxim 1:e1c7c1c636af 362 case ControllerHardwareError:
IanBenzMaxim 1:e1c7c1c636af 363 case SensorNodeHardwareError:
IanBenzMaxim 1:e1c7c1c636af 364 default:
IanBenzMaxim 1:e1c7c1c636af 365 // Do nothing until user resets
IanBenzMaxim 1:e1c7c1c636af 366 break;
IanBenzMaxim 1:e1c7c1c636af 367 }
IanBenzMaxim 1:e1c7c1c636af 368 // Check if status changed
IanBenzMaxim 1:e1c7c1c636af 369 if (currentStatus != nextStatus)
IanBenzMaxim 1:e1c7c1c636af 370 {
IanBenzMaxim 1:e1c7c1c636af 371 currentStatus = nextStatus;
IanBenzMaxim 1:e1c7c1c636af 372 displayStatus(currentStatus); // Display status message on LCD
IanBenzMaxim 1:e1c7c1c636af 373 }
IanBenzMaxim 1:e1c7c1c636af 374
IanBenzMaxim 1:e1c7c1c636af 375 // Change seed value on every loop pass
IanBenzMaxim 1:e1c7c1c636af 376 randomSeed++;
IanBenzMaxim 1:e1c7c1c636af 377 }
IanBenzMaxim 1:e1c7c1c636af 378 }
IanBenzMaxim 1:e1c7c1c636af 379
IanBenzMaxim 1:e1c7c1c636af 380 /// Blink all LEDs for a certain amount of time.
IanBenzMaxim 1:e1c7c1c636af 381 /// @param time_ms Time in ms to blink for.
IanBenzMaxim 1:e1c7c1c636af 382 static void blinkLeds(unsigned int time_ms)
IanBenzMaxim 1:e1c7c1c636af 383 {
IanBenzMaxim 1:e1c7c1c636af 384 tempAlarmLed = !tempAlarmLed;
IanBenzMaxim 1:e1c7c1c636af 385 filterLifeAlarmLed = !filterLifeAlarmLed;
IanBenzMaxim 1:e1c7c1c636af 386 wait_ms(time_ms);
IanBenzMaxim 1:e1c7c1c636af 387 tempAlarmLed = !tempAlarmLed;
IanBenzMaxim 1:e1c7c1c636af 388 filterLifeAlarmLed = !filterLifeAlarmLed;
IanBenzMaxim 1:e1c7c1c636af 389 }
IanBenzMaxim 1:e1c7c1c636af 390
IanBenzMaxim 1:e1c7c1c636af 391 /// Check if a button is pressed and wait for it to be release.
IanBenzMaxim 1:e1c7c1c636af 392 /// @param button Active low button to check.
IanBenzMaxim 1:e1c7c1c636af 393 /// @returns True if pressed.
IanBenzMaxim 1:e1c7c1c636af 394 static bool buttonPressed(DigitalIn & button)
IanBenzMaxim 1:e1c7c1c636af 395 {
IanBenzMaxim 1:e1c7c1c636af 396 const int buttonPressed = 0; // Active low
IanBenzMaxim 1:e1c7c1c636af 397 if (button == buttonPressed)
IanBenzMaxim 1:e1c7c1c636af 398 {
IanBenzMaxim 1:e1c7c1c636af 399 while (button == buttonPressed) ;
IanBenzMaxim 1:e1c7c1c636af 400 return true;
IanBenzMaxim 1:e1c7c1c636af 401 }
IanBenzMaxim 1:e1c7c1c636af 402 // else
IanBenzMaxim 1:e1c7c1c636af 403 return false;
IanBenzMaxim 1:e1c7c1c636af 404 }
IanBenzMaxim 1:e1c7c1c636af 405
IanBenzMaxim 1:e1c7c1c636af 406 /// Display the current status of the Controller on the LCD display.
IanBenzMaxim 1:e1c7c1c636af 407 static void displayStatus(Status status)
IanBenzMaxim 1:e1c7c1c636af 408 {
IanBenzMaxim 1:e1c7c1c636af 409 switch (status)
IanBenzMaxim 1:e1c7c1c636af 410 {
IanBenzMaxim 1:e1c7c1c636af 411 case InitializingController:
IanBenzMaxim 1:e1c7c1c636af 412 lcd.writeMessage("Initializing Controller...");
IanBenzMaxim 1:e1c7c1c636af 413 lcd.setBackLightColor(Teal);
IanBenzMaxim 1:e1c7c1c636af 414 break;
IanBenzMaxim 1:e1c7c1c636af 415
IanBenzMaxim 1:e1c7c1c636af 416 case DisplaySessionId:
IanBenzMaxim 25:37ea43ff81be 417 lcd.writeLine("ID: " + webIntf.sessionIdString(), Display::FirstLine);
IanBenzMaxim 1:e1c7c1c636af 418 lcd.writeLine("Provision to begin", Display::SecondLine);
IanBenzMaxim 1:e1c7c1c636af 419 lcd.setBackLightColor(Teal);
IanBenzMaxim 1:e1c7c1c636af 420 break;
IanBenzMaxim 1:e1c7c1c636af 421
IanBenzMaxim 1:e1c7c1c636af 422 case SensorNodeNeedsDetection:
IanBenzMaxim 1:e1c7c1c636af 423 lcd.writeMessage("Insert Sensor Node and press Provision");
IanBenzMaxim 1:e1c7c1c636af 424 lcd.setBackLightColor(Teal);
IanBenzMaxim 1:e1c7c1c636af 425 break;
IanBenzMaxim 1:e1c7c1c636af 426
IanBenzMaxim 1:e1c7c1c636af 427 case DetectingSensorNode:
IanBenzMaxim 1:e1c7c1c636af 428 lcd.writeMessage("Detecting Sensor Node...");
IanBenzMaxim 1:e1c7c1c636af 429 lcd.setBackLightColor(Teal);
IanBenzMaxim 1:e1c7c1c636af 430 break;
IanBenzMaxim 1:e1c7c1c636af 431
IanBenzMaxim 1:e1c7c1c636af 432 case SensorNodeNeedsProvision:
IanBenzMaxim 1:e1c7c1c636af 433 lcd.writeMessage("Sensor Node Needs Provision");
IanBenzMaxim 1:e1c7c1c636af 434 lcd.setBackLightColor(Teal);
IanBenzMaxim 1:e1c7c1c636af 435 break;
IanBenzMaxim 1:e1c7c1c636af 436
IanBenzMaxim 1:e1c7c1c636af 437 case ProvisioningSensorNode:
IanBenzMaxim 1:e1c7c1c636af 438 lcd.writeMessage("Provisioning Sensor Node");
IanBenzMaxim 1:e1c7c1c636af 439 lcd.setBackLightColor(Teal);
IanBenzMaxim 1:e1c7c1c636af 440 break;
IanBenzMaxim 1:e1c7c1c636af 441
IanBenzMaxim 1:e1c7c1c636af 442 case NormalOperation:
IanBenzMaxim 1:e1c7c1c636af 443 // Everything handled in displaySensorData()
IanBenzMaxim 1:e1c7c1c636af 444 break;
IanBenzMaxim 1:e1c7c1c636af 445
IanBenzMaxim 1:e1c7c1c636af 446 case SensorNodeNotAuthentic:
IanBenzMaxim 1:e1c7c1c636af 447 lcd.writeMessage("Sensor Node Not Authentic");
IanBenzMaxim 25:37ea43ff81be 448 lcd.setBackLightColor(Purple);
IanBenzMaxim 1:e1c7c1c636af 449 break;
IanBenzMaxim 1:e1c7c1c636af 450
IanBenzMaxim 1:e1c7c1c636af 451 case ControllerInitializationError:
IanBenzMaxim 1:e1c7c1c636af 452 lcd.writeMessage("Initialization Error Check Wi-Fi");
IanBenzMaxim 1:e1c7c1c636af 453 lcd.setBackLightColor(Red);
IanBenzMaxim 1:e1c7c1c636af 454 break;
IanBenzMaxim 1:e1c7c1c636af 455
IanBenzMaxim 1:e1c7c1c636af 456 case ControllerHardwareError:
IanBenzMaxim 15:8cc4cdea59da 457 lcd.writeMessage("Controller Hardware Error: Check Wi-Fi");
IanBenzMaxim 1:e1c7c1c636af 458 lcd.setBackLightColor(Red);
IanBenzMaxim 1:e1c7c1c636af 459 break;
IanBenzMaxim 1:e1c7c1c636af 460
IanBenzMaxim 1:e1c7c1c636af 461 case SensorNodeHardwareError:
IanBenzMaxim 1:e1c7c1c636af 462 lcd.writeMessage("Sensor Node Hardware Error");
IanBenzMaxim 1:e1c7c1c636af 463 lcd.setBackLightColor(Red);
IanBenzMaxim 1:e1c7c1c636af 464 break;
IanBenzMaxim 1:e1c7c1c636af 465 }
IanBenzMaxim 1:e1c7c1c636af 466 }
IanBenzMaxim 1:e1c7c1c636af 467
IanBenzMaxim 1:e1c7c1c636af 468 /// Display sensor data on the LCD display during normal operation.
IanBenzMaxim 1:e1c7c1c636af 469 static void displaySensorData(const SensorData & sensorData)
IanBenzMaxim 1:e1c7c1c636af 470 {
IanBenzMaxim 1:e1c7c1c636af 471 std::ostringstream stream;
IanBenzMaxim 25:37ea43ff81be 472 stream << "Chiller Temp: " << static_cast<int>(sensorData.temp) << "C";
IanBenzMaxim 1:e1c7c1c636af 473 lcd.writeCompleteLine(stream.str(), Display::FirstLine);
IanBenzMaxim 1:e1c7c1c636af 474 stream.str(""); // Clear stream
IanBenzMaxim 25:37ea43ff81be 475 stream << "Filter Life: " << static_cast<unsigned int>(sensorData.filterLife) << "%";
IanBenzMaxim 1:e1c7c1c636af 476 lcd.writeCompleteLine(stream.str(), Display::SecondLine);
IanBenzMaxim 25:37ea43ff81be 477 lcd.setBackLightColor(Green);
IanBenzMaxim 1:e1c7c1c636af 478 }
IanBenzMaxim 1:e1c7c1c636af 479
IanBenzMaxim 1:e1c7c1c636af 480 /// Read the Session ID to use with the web server from ROM.
IanBenzMaxim 1:e1c7c1c636af 481 /// @note Session ID is taken from the ROM ID of the MAX66242.
IanBenzMaxim 1:e1c7c1c636af 482 /// @param[out] Session ID string.
IanBenzMaxim 1:e1c7c1c636af 483 /// @returns True on success.
IanBenzMaxim 25:37ea43ff81be 484 static bool readWebSessionId(OneWire::RomId & sessionId)
IanBenzMaxim 1:e1c7c1c636af 485 {
IanBenzMaxim 1:e1c7c1c636af 486 const uint8_t I2C_address = 0x32;
IanBenzMaxim 1:e1c7c1c636af 487 const uint8_t ROM_address = 0x68;
IanBenzMaxim 1:e1c7c1c636af 488 RomId romId;
IanBenzMaxim 1:e1c7c1c636af 489
IanBenzMaxim 1:e1c7c1c636af 490 // Set register pointer
IanBenzMaxim 4:71d578d3af22 491 if (i2c.write(I2C_address, reinterpret_cast<const char *>(&ROM_address), 1) != 0)
IanBenzMaxim 1:e1c7c1c636af 492 return false;
IanBenzMaxim 1:e1c7c1c636af 493 // Read ROM ID
IanBenzMaxim 25:37ea43ff81be 494 if (i2c.read(I2C_address, reinterpret_cast<char *>(romId.buffer.data()), romId.buffer.size()) != 0)
IanBenzMaxim 1:e1c7c1c636af 495 return false;
IanBenzMaxim 1:e1c7c1c636af 496 // Check if CRC valid
IanBenzMaxim 25:37ea43ff81be 497 if (!romId.valid())
IanBenzMaxim 1:e1c7c1c636af 498 return false;
IanBenzMaxim 25:37ea43ff81be 499 sessionId = romId;
IanBenzMaxim 1:e1c7c1c636af 500 return true;
IanBenzMaxim 1:e1c7c1c636af 501 }