Simple sample that demonstrates reading the FXOS8700CQ accelerometer, convert the data to JSON and send to an Azure IoT Hub.
Dependencies: azure_umqtt_c iothub_mqtt_transport mbed-rtos mbed wolfSSL Socket lwip-eth lwip-sys lwip
main.cpp@2:2b9acda15ef0, 2016-10-27 (annotated)
- Committer:
- markrad
- Date:
- Thu Oct 27 22:44:50 2016 +0000
- Revision:
- 2:2b9acda15ef0
- Parent:
- 1:0366fad6e60c
- Child:
- 3:c0556ff7b8e3
Prevent further messages being generated if there are more than two in the queue waiting to be sent.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
markrad | 0:6c46c366f500 | 1 | // Copyright (c) Microsoft. All rights reserved. |
markrad | 0:6c46c366f500 | 2 | // Licensed under the MIT license. See LICENSE file at https://github.com/Azure/azure-iot-sdks/blob/master/LICENSE for full license information. |
markrad | 0:6c46c366f500 | 3 | |
markrad | 0:6c46c366f500 | 4 | /* -------------------------------------------------------------------------- *\ |
markrad | 0:6c46c366f500 | 5 | |
markrad | 0:6c46c366f500 | 6 | Simple progam to demonstrate reading the FRDM-K64F FXOS8700CQ |
markrad | 0:6c46c366f500 | 7 | accelerometer, convert the data to JSON and send to an Azure IoT Hub. You |
markrad | 0:6c46c366f500 | 8 | must provide your hub's connection string in the variable |
markrad | 0:6c46c366f500 | 9 | 'connectionString'. |
markrad | 0:6c46c366f500 | 10 | |
markrad | 0:6c46c366f500 | 11 | markrad |
markrad | 0:6c46c366f500 | 12 | |
markrad | 0:6c46c366f500 | 13 | \* -------------------------------------------------------------------------- */ |
markrad | 0:6c46c366f500 | 14 | |
markrad | 0:6c46c366f500 | 15 | #include <string.h> |
markrad | 0:6c46c366f500 | 16 | |
markrad | 0:6c46c366f500 | 17 | #include "SingletonFXOS8700CQ.h" |
markrad | 0:6c46c366f500 | 18 | |
markrad | 0:6c46c366f500 | 19 | #include "iothub_client.h" |
markrad | 0:6c46c366f500 | 20 | #include "iothub_message.h" |
markrad | 0:6c46c366f500 | 21 | #include "azure_c_shared_utility/threadapi.h" |
markrad | 0:6c46c366f500 | 22 | #include "azure_c_shared_utility/crt_abstractions.h" |
markrad | 0:6c46c366f500 | 23 | #include "azure_c_shared_utility/platform.h" |
markrad | 0:6c46c366f500 | 24 | #include "iothubtransportmqtt.h" |
markrad | 2:2b9acda15ef0 | 25 | #include "lock.h" |
markrad | 0:6c46c366f500 | 26 | |
markrad | 0:6c46c366f500 | 27 | #include "certs.h" |
markrad | 0:6c46c366f500 | 28 | |
markrad | 0:6c46c366f500 | 29 | int readingToJSON(char *buffer, int bufferlen, READING &reading) |
markrad | 0:6c46c366f500 | 30 | { |
markrad | 0:6c46c366f500 | 31 | static const char READING[] = "\"reading\""; |
markrad | 0:6c46c366f500 | 32 | static const char ACCELEROMETER[] = "\"accelerometer\""; |
markrad | 0:6c46c366f500 | 33 | static const char MAGNOMETER[] = "\"magnometer\""; |
markrad | 0:6c46c366f500 | 34 | static const char X[] = "\"X\""; |
markrad | 0:6c46c366f500 | 35 | static const char Y[] = "\"Y\""; |
markrad | 0:6c46c366f500 | 36 | static const char Z[] = "\"Z\""; |
markrad | 0:6c46c366f500 | 37 | static const char STARTOBJ[] = " : {\n"; |
markrad | 0:6c46c366f500 | 38 | static const char ENDOBJ[] = "}\n"; |
markrad | 0:6c46c366f500 | 39 | static const char PREPEND[] = "{\n"; |
markrad | 0:6c46c366f500 | 40 | static const int MINBUFFERLEN = |
markrad | 0:6c46c366f500 | 41 | sizeof(READING) + |
markrad | 0:6c46c366f500 | 42 | sizeof(ACCELEROMETER) + |
markrad | 0:6c46c366f500 | 43 | sizeof(MAGNOMETER) + |
markrad | 0:6c46c366f500 | 44 | 2 * (sizeof(X) + sizeof(Y) + sizeof(Z)) + |
markrad | 0:6c46c366f500 | 45 | 3 * sizeof(STARTOBJ) + |
markrad | 0:6c46c366f500 | 46 | 4 * sizeof(ENDOBJ) + |
markrad | 0:6c46c366f500 | 47 | sizeof(PREPEND) + |
markrad | 0:6c46c366f500 | 48 | 6 * 9; |
markrad | 0:6c46c366f500 | 49 | static const char numConvert[] = "%d"; |
markrad | 0:6c46c366f500 | 50 | |
markrad | 0:6c46c366f500 | 51 | char toNum[10]; |
markrad | 0:6c46c366f500 | 52 | char work[MINBUFFERLEN + 1]; |
markrad | 0:6c46c366f500 | 53 | |
markrad | 0:6c46c366f500 | 54 | if (buffer == NULL) |
markrad | 0:6c46c366f500 | 55 | return 0; |
markrad | 0:6c46c366f500 | 56 | |
markrad | 0:6c46c366f500 | 57 | buffer[0] = '\0'; |
markrad | 0:6c46c366f500 | 58 | |
markrad | 0:6c46c366f500 | 59 | strcpy(work, PREPEND); |
markrad | 0:6c46c366f500 | 60 | strcat(work, READING); |
markrad | 0:6c46c366f500 | 61 | strcat(work, STARTOBJ); |
markrad | 0:6c46c366f500 | 62 | strcat(work, ACCELEROMETER); |
markrad | 0:6c46c366f500 | 63 | strcat(work, STARTOBJ); |
markrad | 0:6c46c366f500 | 64 | strcat(work, X); |
markrad | 0:6c46c366f500 | 65 | strcat(work, " : "); |
markrad | 0:6c46c366f500 | 66 | sprintf(toNum, numConvert, reading.accelerometer.x); |
markrad | 0:6c46c366f500 | 67 | strcat(work, toNum); |
markrad | 0:6c46c366f500 | 68 | strcat(work, ",\n"); |
markrad | 0:6c46c366f500 | 69 | strcat(work, Y); |
markrad | 0:6c46c366f500 | 70 | strcat(work, " : "); |
markrad | 0:6c46c366f500 | 71 | sprintf(toNum, numConvert, reading.accelerometer.y); |
markrad | 0:6c46c366f500 | 72 | strcat(work, toNum); |
markrad | 0:6c46c366f500 | 73 | strcat(work, ",\n"); |
markrad | 0:6c46c366f500 | 74 | strcat(work, Z); |
markrad | 0:6c46c366f500 | 75 | strcat(work, " : "); |
markrad | 0:6c46c366f500 | 76 | sprintf(toNum, numConvert, reading.accelerometer.z); |
markrad | 0:6c46c366f500 | 77 | strcat(work, toNum); |
markrad | 0:6c46c366f500 | 78 | strcat(work, "\n"); |
markrad | 0:6c46c366f500 | 79 | strcat(work, ENDOBJ); |
markrad | 0:6c46c366f500 | 80 | strcat(work, MAGNOMETER); |
markrad | 0:6c46c366f500 | 81 | strcat(work, STARTOBJ); |
markrad | 0:6c46c366f500 | 82 | strcat(work, X); |
markrad | 0:6c46c366f500 | 83 | strcat(work, " : "); |
markrad | 0:6c46c366f500 | 84 | sprintf(toNum, numConvert, reading.magnometer.x); |
markrad | 0:6c46c366f500 | 85 | strcat(work, toNum); |
markrad | 0:6c46c366f500 | 86 | strcat(work, ",\n"); |
markrad | 0:6c46c366f500 | 87 | strcat(work, Y); |
markrad | 0:6c46c366f500 | 88 | strcat(work, " : "); |
markrad | 0:6c46c366f500 | 89 | sprintf(toNum, numConvert, reading.magnometer.y); |
markrad | 0:6c46c366f500 | 90 | strcat(work, toNum); |
markrad | 0:6c46c366f500 | 91 | strcat(work, ",\n"); |
markrad | 0:6c46c366f500 | 92 | strcat(work, Z); |
markrad | 0:6c46c366f500 | 93 | strcat(work, " : "); |
markrad | 0:6c46c366f500 | 94 | sprintf(toNum, numConvert, reading.magnometer.z); |
markrad | 0:6c46c366f500 | 95 | strcat(work, toNum); |
markrad | 0:6c46c366f500 | 96 | strcat(work, "\n"); |
markrad | 0:6c46c366f500 | 97 | strcat(work, ENDOBJ); |
markrad | 0:6c46c366f500 | 98 | strcat(work, ENDOBJ); |
markrad | 0:6c46c366f500 | 99 | strcat(work, ENDOBJ); |
markrad | 0:6c46c366f500 | 100 | |
markrad | 0:6c46c366f500 | 101 | if (strlen(work) + 1 < bufferlen) |
markrad | 0:6c46c366f500 | 102 | strcpy(buffer, work); |
markrad | 0:6c46c366f500 | 103 | |
markrad | 0:6c46c366f500 | 104 | return strlen(work); |
markrad | 0:6c46c366f500 | 105 | } |
markrad | 0:6c46c366f500 | 106 | |
markrad | 2:2b9acda15ef0 | 107 | static LOCK_HANDLE msgLock; |
markrad | 2:2b9acda15ef0 | 108 | static int msgCount = 0; |
markrad | 2:2b9acda15ef0 | 109 | |
markrad | 0:6c46c366f500 | 110 | static IOTHUBMESSAGE_DISPOSITION_RESULT ReceiveMessageCallback(IOTHUB_MESSAGE_HANDLE message, void* userContextCallback) |
markrad | 0:6c46c366f500 | 111 | { |
markrad | 0:6c46c366f500 | 112 | int* counter = (int*)userContextCallback; |
markrad | 0:6c46c366f500 | 113 | const char* buffer; |
markrad | 0:6c46c366f500 | 114 | size_t size; |
markrad | 0:6c46c366f500 | 115 | |
markrad | 0:6c46c366f500 | 116 | if (IoTHubMessage_GetByteArray(message, (const unsigned char**)&buffer, &size) != IOTHUB_MESSAGE_OK) |
markrad | 0:6c46c366f500 | 117 | { |
markrad | 0:6c46c366f500 | 118 | (void)printf("unable to retrieve the message data\r\n"); |
markrad | 0:6c46c366f500 | 119 | } |
markrad | 0:6c46c366f500 | 120 | else |
markrad | 0:6c46c366f500 | 121 | { |
markrad | 0:6c46c366f500 | 122 | (void)printf("Received Message [%d] with Data: <<<%.*s>>> & Size=%d\r\n", *counter, (int)size, buffer, (int)size); |
markrad | 0:6c46c366f500 | 123 | } |
markrad | 0:6c46c366f500 | 124 | |
markrad | 0:6c46c366f500 | 125 | // Some device specific action code goes here... |
markrad | 0:6c46c366f500 | 126 | (*counter)++; |
markrad | 0:6c46c366f500 | 127 | |
markrad | 0:6c46c366f500 | 128 | return IOTHUBMESSAGE_ACCEPTED; |
markrad | 0:6c46c366f500 | 129 | } |
markrad | 0:6c46c366f500 | 130 | |
markrad | 0:6c46c366f500 | 131 | static void SendConfirmationCallback(IOTHUB_CLIENT_CONFIRMATION_RESULT result, void* userContextCallback) |
markrad | 0:6c46c366f500 | 132 | { |
markrad | 2:2b9acda15ef0 | 133 | int* messageTrackingId = (int*)userContextCallback; |
markrad | 0:6c46c366f500 | 134 | |
markrad | 0:6c46c366f500 | 135 | (void)printf("Confirmation received for message tracking id = %d with result = %s\r\n", |
markrad | 2:2b9acda15ef0 | 136 | *messageTrackingId, ENUM_TO_STRING(IOTHUB_CLIENT_CONFIRMATION_RESULT, result)); |
markrad | 0:6c46c366f500 | 137 | |
markrad | 2:2b9acda15ef0 | 138 | free(userContextCallback); |
markrad | 2:2b9acda15ef0 | 139 | Lock(msgLock); |
markrad | 2:2b9acda15ef0 | 140 | msgCount--; |
markrad | 2:2b9acda15ef0 | 141 | Unlock(msgLock); |
markrad | 2:2b9acda15ef0 | 142 | |
markrad | 0:6c46c366f500 | 143 | } |
markrad | 0:6c46c366f500 | 144 | |
markrad | 0:6c46c366f500 | 145 | void stall(Serial &pc, char *message) |
markrad | 0:6c46c366f500 | 146 | { |
markrad | 0:6c46c366f500 | 147 | printf(message); |
markrad | 0:6c46c366f500 | 148 | printf("stalled "); |
markrad | 0:6c46c366f500 | 149 | |
markrad | 0:6c46c366f500 | 150 | while(true) { |
markrad | 0:6c46c366f500 | 151 | pc.putc('.'); // idle dots |
markrad | 0:6c46c366f500 | 152 | wait(1.0); |
markrad | 0:6c46c366f500 | 153 | } |
markrad | 0:6c46c366f500 | 154 | } |
markrad | 0:6c46c366f500 | 155 | |
markrad | 0:6c46c366f500 | 156 | int main() |
markrad | 0:6c46c366f500 | 157 | { |
markrad | 2:2b9acda15ef0 | 158 | const char *connectionString = "HostName=MarkRadML.azure-devices.net;DeviceId=MBEDTest;SharedAccessKey=rgxlnR0rIBW4vnnnDkrbAv+mSOc/Mt60mg1CEjLx7pY="; |
markrad | 0:6c46c366f500 | 159 | |
markrad | 0:6c46c366f500 | 160 | READING reading; |
markrad | 0:6c46c366f500 | 161 | Serial pc(USBTX, USBRX); // Primary output to demonstrate library |
markrad | 0:6c46c366f500 | 162 | SingletonFXOS8700CQ &sfxos = SingletonFXOS8700CQ::getInstance(); |
markrad | 0:6c46c366f500 | 163 | IOTHUB_CLIENT_HANDLE iotHubClientHandle; |
markrad | 0:6c46c366f500 | 164 | int receiveContext = 0; |
markrad | 0:6c46c366f500 | 165 | int transmitCounter = 0; |
markrad | 2:2b9acda15ef0 | 166 | |
markrad | 0:6c46c366f500 | 167 | pc.baud(115200); // Print quickly! 200Hz x line of output data! |
markrad | 0:6c46c366f500 | 168 | |
markrad | 0:6c46c366f500 | 169 | printf("\n\nFXOS8700CQ identity = %X\n", sfxos.getWhoAmI()); |
markrad | 0:6c46c366f500 | 170 | |
markrad | 2:2b9acda15ef0 | 171 | msgLock = Lock_Init(); // TODO: Check error code |
markrad | 2:2b9acda15ef0 | 172 | |
markrad | 0:6c46c366f500 | 173 | sfxos.enable(); |
markrad | 0:6c46c366f500 | 174 | sfxos.getData(reading); |
markrad | 0:6c46c366f500 | 175 | |
markrad | 0:6c46c366f500 | 176 | int rc; |
markrad | 0:6c46c366f500 | 177 | |
markrad | 0:6c46c366f500 | 178 | if (platform_init() != 0) |
markrad | 0:6c46c366f500 | 179 | stall(pc, "Failed to initialize platform\n"); |
markrad | 0:6c46c366f500 | 180 | |
markrad | 0:6c46c366f500 | 181 | if ((iotHubClientHandle = IoTHubClient_CreateFromConnectionString(connectionString, MQTT_Protocol)) == NULL) |
markrad | 0:6c46c366f500 | 182 | stall(pc, "ERROR: Could not create iotHubClientHandle\n"); |
markrad | 0:6c46c366f500 | 183 | |
markrad | 1:0366fad6e60c | 184 | bool traceOn = false; |
markrad | 1:0366fad6e60c | 185 | //bool traceOn = true; |
markrad | 0:6c46c366f500 | 186 | |
markrad | 0:6c46c366f500 | 187 | IoTHubClient_SetOption(iotHubClientHandle, "logtrace", &traceOn); |
markrad | 0:6c46c366f500 | 188 | |
markrad | 0:6c46c366f500 | 189 | // For mbed add the certificate information |
markrad | 0:6c46c366f500 | 190 | if (IoTHubClient_SetOption(iotHubClientHandle, "TrustedCerts", certificates) != IOTHUB_CLIENT_OK) |
markrad | 0:6c46c366f500 | 191 | stall(pc, "ERROR: failure to set option \"TrustedCerts\"\n"); |
markrad | 0:6c46c366f500 | 192 | |
markrad | 0:6c46c366f500 | 193 | if (IoTHubClient_SetMessageCallback(iotHubClientHandle, ReceiveMessageCallback, &receiveContext) != IOTHUB_CLIENT_OK) |
markrad | 0:6c46c366f500 | 194 | stall(pc, "ERROR: IoTHubClient_SetMessageCallback failed\r\n"); |
markrad | 0:6c46c366f500 | 195 | |
markrad | 1:0366fad6e60c | 196 | int LOOPCOUNT = -1; // Set to -1 to run forever |
markrad | 0:6c46c366f500 | 197 | |
markrad | 2:2b9acda15ef0 | 198 | int localMsgCount; |
markrad | 2:2b9acda15ef0 | 199 | int *userContext; |
markrad | 2:2b9acda15ef0 | 200 | IOTHUB_MESSAGE_HANDLE msgHandle; |
markrad | 2:2b9acda15ef0 | 201 | |
markrad | 0:6c46c366f500 | 202 | char buffer[200]; |
markrad | 0:6c46c366f500 | 203 | |
markrad | 0:6c46c366f500 | 204 | while (LOOPCOUNT) |
markrad | 0:6c46c366f500 | 205 | { |
markrad | 0:6c46c366f500 | 206 | if (sfxos.getInt2Triggered()) |
markrad | 0:6c46c366f500 | 207 | { |
markrad | 0:6c46c366f500 | 208 | sfxos.setInt2Triggered(false); |
markrad | 0:6c46c366f500 | 209 | sfxos.getData(reading); |
markrad | 0:6c46c366f500 | 210 | rc = readingToJSON(buffer, sizeof(buffer), reading); |
markrad | 0:6c46c366f500 | 211 | |
markrad | 0:6c46c366f500 | 212 | if (rc > sizeof(buffer)) |
markrad | 0:6c46c366f500 | 213 | printf("ERROR: JSON buffer too small - require %d characters\n", rc); |
markrad | 0:6c46c366f500 | 214 | |
markrad | 2:2b9acda15ef0 | 215 | Lock(msgLock); |
markrad | 2:2b9acda15ef0 | 216 | localMsgCount = msgCount; |
markrad | 2:2b9acda15ef0 | 217 | Unlock(msgLock); |
markrad | 0:6c46c366f500 | 218 | |
markrad | 2:2b9acda15ef0 | 219 | if (localMsgCount < 2) |
markrad | 0:6c46c366f500 | 220 | { |
markrad | 2:2b9acda15ef0 | 221 | if ((msgHandle = IoTHubMessage_CreateFromByteArray((const unsigned char*)buffer, rc)) == NULL) |
markrad | 0:6c46c366f500 | 222 | { |
markrad | 0:6c46c366f500 | 223 | (void)printf("ERROR: iotHubMessageHandle is NULL!\r\n"); |
markrad | 0:6c46c366f500 | 224 | } |
markrad | 0:6c46c366f500 | 225 | else |
markrad | 0:6c46c366f500 | 226 | { |
markrad | 2:2b9acda15ef0 | 227 | userContext = (int *) malloc(sizeof(userContext)); |
markrad | 2:2b9acda15ef0 | 228 | |
markrad | 2:2b9acda15ef0 | 229 | if (userContext != NULL) |
markrad | 0:6c46c366f500 | 230 | { |
markrad | 2:2b9acda15ef0 | 231 | *userContext = transmitCounter; |
markrad | 2:2b9acda15ef0 | 232 | |
markrad | 2:2b9acda15ef0 | 233 | if (IoTHubClient_SendEventAsync(iotHubClientHandle, msgHandle, SendConfirmationCallback, userContext) != IOTHUB_CLIENT_OK) |
markrad | 2:2b9acda15ef0 | 234 | { |
markrad | 2:2b9acda15ef0 | 235 | (void)printf("ERROR: IoTHubClient_LL_SendEventAsync..........FAILED!\r\n"); |
markrad | 2:2b9acda15ef0 | 236 | } |
markrad | 2:2b9acda15ef0 | 237 | else |
markrad | 2:2b9acda15ef0 | 238 | { |
markrad | 2:2b9acda15ef0 | 239 | (void)printf("IoTHubClient_LL_SendEventAsync accepted message [%d] for transmission to IoT Hub.\r\n", (int)transmitCounter); |
markrad | 2:2b9acda15ef0 | 240 | } |
markrad | 2:2b9acda15ef0 | 241 | |
markrad | 2:2b9acda15ef0 | 242 | IoTHubMessage_Destroy(msgHandle); |
markrad | 2:2b9acda15ef0 | 243 | Lock(msgLock); |
markrad | 2:2b9acda15ef0 | 244 | msgCount++; |
markrad | 2:2b9acda15ef0 | 245 | Unlock(msgLock); |
markrad | 2:2b9acda15ef0 | 246 | |
markrad | 2:2b9acda15ef0 | 247 | transmitCounter++; |
markrad | 0:6c46c366f500 | 248 | } |
markrad | 0:6c46c366f500 | 249 | else |
markrad | 0:6c46c366f500 | 250 | { |
markrad | 2:2b9acda15ef0 | 251 | (void)printf("ERROR: malloc - unable to allocate user context\r\n"); |
markrad | 0:6c46c366f500 | 252 | } |
markrad | 0:6c46c366f500 | 253 | } |
markrad | 0:6c46c366f500 | 254 | } |
markrad | 2:2b9acda15ef0 | 255 | else |
markrad | 2:2b9acda15ef0 | 256 | { |
markrad | 2:2b9acda15ef0 | 257 | (void)printf("Message dropped queue length %d\r\n", localMsgCount); |
markrad | 2:2b9acda15ef0 | 258 | } |
markrad | 0:6c46c366f500 | 259 | |
markrad | 0:6c46c366f500 | 260 | LOOPCOUNT--; |
markrad | 0:6c46c366f500 | 261 | } |
markrad | 0:6c46c366f500 | 262 | |
markrad | 0:6c46c366f500 | 263 | wait_ms(500); |
markrad | 0:6c46c366f500 | 264 | } |
markrad | 0:6c46c366f500 | 265 | |
markrad | 0:6c46c366f500 | 266 | printf("Loop complete - clean up\n"); |
markrad | 0:6c46c366f500 | 267 | |
markrad | 0:6c46c366f500 | 268 | IoTHubClient_Destroy(iotHubClientHandle); |
markrad | 0:6c46c366f500 | 269 | |
markrad | 2:2b9acda15ef0 | 270 | Lock_Deinit(msgLock); |
markrad | 2:2b9acda15ef0 | 271 | |
markrad | 0:6c46c366f500 | 272 | platform_deinit(); |
markrad | 0:6c46c366f500 | 273 | |
markrad | 0:6c46c366f500 | 274 | printf("Test complete\n"); |
markrad | 0:6c46c366f500 | 275 | |
markrad | 0:6c46c366f500 | 276 | |
markrad | 0:6c46c366f500 | 277 | while(true) { |
markrad | 0:6c46c366f500 | 278 | pc.putc('.'); // idle dots |
markrad | 0:6c46c366f500 | 279 | wait(1.0); |
markrad | 0:6c46c366f500 | 280 | } |
markrad | 0:6c46c366f500 | 281 | } |