main.cpp

00001 // ----------------------------------------------------------------------------
00002 // Copyright 2016-2018 ARM Ltd.
00003 //
00004 // SPDX-License-Identifier: Apache-2.0
00005 //
00006 // Licensed under the Apache License, Version 2.0 (the "License");
00007 // you may not use this file except in compliance with the License.
00008 // You may obtain a copy of the License at
00009 //
00010 //     http://www.apache.org/licenses/LICENSE-2.0
00011 //
00012 // Unless required by applicable law or agreed to in writing, software
00013 // distributed under the License is distributed on an "AS IS" BASIS,
00014 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00015 // See the License for the specific language governing permissions and
00016 // limitations under the License.
00017 // ----------------------------------------------------------------------------
00018 #ifndef MBED_TEST_MODE
00019 
00020 
00021 #include "mbed.h"
00022 #include "simple-mbed-cloud-client.h"
00023 #include "LittleFileSystem.h"
00024 
00025 // Default network interface object. Don't forget to change the WiFi SSID/password in mbed_app.json if you're using WiFi.
00026 NetworkInterface *net;
00027 
00028 // Default block device available on the target board
00029 BlockDevice* bd = BlockDevice::get_default_instance();
00030 SlicingBlockDevice sd(bd, 0, 2*1024*1024);
00031 
00032 #if COMPONENT_SD || COMPONENT_NUSD
00033 // Use FATFileSystem for SD card type blockdevices
00034 FATFileSystem fs("fs");
00035 #else
00036 // Use LittleFileSystem for non-SD block devices to enable wear leveling and other functions
00037 LittleFileSystem fs("fs");
00038 #endif
00039 
00040 // Default User button for GET example and for resetting the storage
00041 InterruptIn button(BUTTON1);
00042 // Default LED to use for PUT/POST example
00043 DigitalOut led(LED1, 1);
00044 
00045 // How often to fetch sensor data (in seconds)
00046 #define SENSORS_POLL_INTERVAL 3.0
00047 
00048 
00049 
00050 // Sensors related includes and initialization
00051 
00052 
00053 // Temperature reading from microcontroller
00054 AnalogIn adc_temp(ADC_TEMP);
00055 // Voltage reference reading from microcontroller
00056 AnalogIn adc_vref(ADC_VREF);
00057 
00058 // Declaring pointers for access to Pelion Client resources outside of main()
00059 MbedCloudClientResource *res_button;
00060 MbedCloudClientResource *res_led;
00061 
00062 
00063 MbedCloudClientResource *res_adc_temp;
00064 MbedCloudClientResource *res_adc_voltage;
00065 
00066 
00067 // An event queue is a very useful structure to debounce information between contexts (e.g. ISR and normal threads)
00068 // This is great because things such as network operations are illegal in ISR, so updating a resource in a button's fall() function is not allowed
00069 EventQueue eventQueue;
00070 
00071 // When the device is registered, this variable will be used to access various useful information, like device ID etc.
00072 static const ConnectorClientEndpointInfo* endpointInfo;
00073 
00074 /**
00075  * PUT handler
00076  * @param resource The resource that triggered the callback
00077  * @param newValue Updated value for the resource
00078  */
00079 void put_callback(MbedCloudClientResource *resource, m2m::String newValue) {
00080     printf("*** PUT received, new value: %s                             \n", newValue.c_str());
00081     led = atoi(newValue.c_str());
00082 }
00083 
00084 /**
00085  * POST handler
00086  * @param resource The resource that triggered the callback
00087  * @param buffer If a body was passed to the POST function, this contains the data.
00088  *               Note that the buffer is deallocated after leaving this function, so copy it if you need it longer.
00089  * @param size Size of the body
00090  */
00091 void post_callback(MbedCloudClientResource *resource, const uint8_t *buffer, uint16_t size) {
00092     printf("*** POST received (length %u). Payload: ", size);
00093     for (size_t ix = 0; ix < size; ix++) {
00094         printf("%02x ", buffer[ix]);
00095     }
00096     printf("\n");
00097 }
00098 
00099 /**
00100  * Button function triggered by the physical button press.
00101  */
00102 void button_press() {
00103     int v = res_button->get_value_int() + 1;
00104     res_button->set_value(v);
00105     printf("*** Button clicked %d times                                 \n", v);
00106 }
00107 
00108 /**
00109  * Notification callback handler
00110  * @param resource The resource that triggered the callback
00111  * @param status The delivery status of the notification
00112  */
00113 void button_callback(MbedCloudClientResource *resource, const NoticationDeliveryStatus status) {
00114     printf("*** Button notification, status %s (%d)                     \n", MbedCloudClientResource::delivery_status_to_string(status), status);
00115 }
00116 
00117 /**
00118  * Registration callback handler
00119  * @param endpoint Information about the registered endpoint such as the name (so you can find it back in portal)
00120  */
00121 void registered(const ConnectorClientEndpointInfo *endpoint) {
00122     printf("Registered to Pelion Device Management. Endpoint Name: %s\n", endpoint->internal_endpoint_name.c_str());
00123     endpointInfo = endpoint;
00124 }
00125 
00126 /**
00127  * Initialize sensors
00128  */
00129 void sensors_init() {
00130 
00131     printf ("\nSensors configuration:\n");
00132 
00133     printf("\n"); ;
00134 }
00135 
00136 /**
00137  * Update sensors and report their values.
00138  * This function is called periodically.
00139  */
00140 void sensors_update() {
00141     float temp3_value,  volt_value = 0.0;
00142 
00143     temp3_value = adc_temp.read()*100;
00144     volt_value = adc_vref.read();
00145 
00146 
00147 
00148     if (endpointInfo) {
00149 
00150         res_adc_temp->set_value(temp3_value);
00151         res_adc_voltage->set_value(volt_value);
00152 
00153     }
00154 }
00155 
00156 int main(void) {
00157     printf("\nStarting Simple Pelion Device Management Client example\n");
00158 
00159     int storage_status = fs.mount(&sd);
00160     if (storage_status != 0) {
00161         printf("Storage mounting failed.\n");
00162     }
00163     // If the User button is pressed ons start, then format storage.
00164     bool btn_pressed = (button.read() == MBED_CONF_APP_BUTTON_PRESSED_STATE);
00165     if (btn_pressed) {
00166         printf("User button is pushed on start...\n");
00167     }
00168 
00169     if (storage_status || btn_pressed) {
00170         printf("Formatting the storage...\n");
00171         int storage_status = StorageHelper::format(&fs, &sd);
00172         if (storage_status != 0) {
00173             printf("ERROR: Failed to reformat the storage (%d).\n", storage_status);
00174         }
00175     } else {
00176         printf("You can hold the user button during boot to format the storage and change the device identity.\n");
00177     }
00178 
00179     sensors_init();
00180 
00181     // Connect to the internet (DHCP is expected to be on)
00182     printf("Connecting to the network using Wifi...\n");
00183     net = NetworkInterface::get_default_instance();
00184 
00185     nsapi_error_t net_status = -1;
00186     for (int tries = 0; tries < 3; tries++) {
00187         net_status = net->connect();
00188         if (net_status == NSAPI_ERROR_OK) {
00189             break;
00190         } else {
00191             printf("Unable to connect to network. Retrying...\n");
00192         }
00193     }
00194 
00195     if (net_status != NSAPI_ERROR_OK) {
00196         printf("ERROR: Connecting to the network failed (%d)!\n", net_status);
00197         return -1;
00198     }
00199 
00200     printf("Connected to the network successfully. IP address: %s\n", net->get_ip_address());
00201 
00202     printf("Initializing Pelion Device Management Client...\n");
00203 
00204     // SimpleMbedCloudClient handles registering over LwM2M to Pelion DM
00205     SimpleMbedCloudClient client(net, bd, &fs);
00206     int client_status = client.init();
00207     if (client_status != 0) {
00208         printf("ERROR: Pelion Client initialization failed (%d)\n", client_status);
00209         return -1;
00210     }
00211 
00212     // Creating resources, which can be written or read from the cloud
00213     res_button = client.create_resource("3200/0/5501", "Button Count");
00214     res_button->set_value(0);
00215     res_button->methods(M2MMethod::GET);
00216     res_button->observable(true);
00217     res_button->attach_notification_callback(button_callback);
00218 
00219     res_led = client.create_resource("3201/0/5853", "LED State");
00220     res_led->set_value(1);
00221     res_led->methods(M2MMethod::GET | M2MMethod::PUT);
00222     res_led->attach_put_callback(put_callback);
00223 
00224     res_adc_temp = client.create_resource("3303/2/5700", "Temperature ADC (C)");
00225     res_adc_temp->set_value(0);
00226     res_adc_temp->methods(M2MMethod::GET);
00227     res_adc_temp->observable(true);
00228 
00229     res_adc_voltage = client.create_resource("3316/0/5700", "Voltage");
00230     res_adc_voltage->set_value(0);
00231     res_adc_voltage->methods(M2MMethod::GET);
00232     res_adc_voltage->observable(true);
00233 
00234     printf("Initialized Pelion Client. Registering...\n");
00235 
00236     // Callback that fires when registering is complete
00237     client.on_registered(&registered);
00238 
00239     // Register with Pelion DM
00240     client.register_and_connect();
00241 
00242     int i = 600; // wait up 60 seconds before attaching sensors and button events
00243     while (i-- > 0 && !client.is_client_registered()) {
00244         wait_ms(100);
00245     }
00246 
00247     button.fall(eventQueue.event(&button_press));
00248 
00249     // The timer fires on an interrupt context, but debounces it to the eventqueue, so it's safe to do network operations
00250     Ticker timer;
00251     timer.attach(eventQueue.event(&sensors_update), SENSORS_POLL_INTERVAL);
00252 
00253     // You can easily run the eventQueue in a separate thread if required
00254     eventQueue.dispatch_forever();
00255 }
00256 
00257 #endif