Mbed OS Device Management example for various ST boards.


This example application is not maintained and not recommended. It uses an old version of Mbed OS, Pelion DM and Arm toolchain. It doesn't work with Mbed Studio.

Please use: https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-pelion/

This example is known to work great on the following platforms:

  • DISCO_L475E_IOT01A - onboard WiFI and onboard QSPI flash. Board specific example using onboard sensors is available here.
  • DISCO_F413H - onboard WiFI and onboard QSPI flash.
  • DISCO_F469NI - WizFi310 WiFI shield and onboard QSPI flash (see WiFi shield instructions).
  • DISCO_F746NG - onboard Ethernet and using onboard QSPI flash.
  • DISCO_F769NI - onboard Ethernet and using onboard QSPI flash.
  • DISCO_L496AG - WizFi310 WiFI shield and onboard QSPI flash (see WiFi shield instructions).
  • NUCLEO_F207ZG - onboard Ethernet and wired SD card (SD card wiring instructions).
  • NUCLEO_F412ZG - WizFi310 WiFI shield and SD card shield (see WiFi shield instructions).
  • NUCLEO_F429ZI - onboard Ethernet and wired SD card (SD card wiring instructions).
  • NUCLEO_F746ZG - onboard Ethernet and wired SD card (SD card wiring instructions).
  • NUCLEO_F767ZI - onboard Ethernet and wired SD card (SD card wiring instructions).
  • NUCLEO_L476RG - WizFi310 WiFI shield and SD card shield (see WiFi shield instructions).
  • NUCLEO_L496ZG - WizFi310 WiFI shield and SD card shield (see WiFi shield instructions).
  • NUCLEO_L4R5ZI - WizFi310 WiFI shield and SD card shield (see WiFi shield instructions).

Follow the Quick-Start instructions: https://cloud.mbed.com/quick-start


Example functionality

This example showcases the following device functionality:

  • Read ADC temperature and ADC vref, and report them as Pelion LWM2M resources (see image below).
  • On user button click, increment Pelion LWM2M button resource.
  • Allow the user to change the state of the board LED from Pelion LWM2M led_state resource and PUT request.


SD card wiring

The ST Nucleo family of boards don't have storage onboard and therefore you will need an SD card. A limitation on ST Nucleo 144 boards is that there's a conflict between Ethernet and SPI pins on Arduino D11. Due to this, the SD card must be wired to different SPI bus that doesn't conflict with other functionality. The image below provide instructions on how to wire an SD card to a non-conflicting SPI instance.


If you are not a first-time Pelion Device Management user your device's SD card may already have connect and update certificates on it. If this is the case, remove and manually format your micro SD card, flash the binary to the device and then re-insert your micro SD card.

WiFi shield setup/wiring

Some ST Nucleo and Discovery boards don't have IP connectivity option, but bundled with a WiFi shield, they can take benefit of full device management capabilities. See links to reference images below on how to wire WizFI310 WiFi shield and/or SD card shield:

Use this example with Mbed CLI

1. Import the application into your desktop:

mbed import /teams/ST/code/pelion-example-common

cd pelion-example-common

2. Install the CLOUD_SDK_API_KEY


For instructions on how to generate your API key, please see the documentation.

3. Initialize firmware credentials (done once per repository). You can use the following command:

mbed dm init -d "<your company name in Pelion DM>" --model-name "<product model identifier>" -q --force

If above command do not work for your Mbed CLI, please consider upgrading Mbed CLI to version 1.8.x or above.

4. Compile and program:

mbed compile -t <toolchain> -m <TARGET_BOARD>

(supported toolchains : GCC_ARM / ARM / IAR)

Thu Mar 21 22:03:46 2019 +0000
Update target support for DISCO_L475VG_IOT01A

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:ea30ba97a865 1 // ----------------------------------------------------------------------------
screamer 0:ea30ba97a865 2 // Copyright 2016-2018 ARM Ltd.
screamer 0:ea30ba97a865 3 //
screamer 0:ea30ba97a865 4 // SPDX-License-Identifier: Apache-2.0
screamer 0:ea30ba97a865 5 //
screamer 0:ea30ba97a865 6 // Licensed under the Apache License, Version 2.0 (the "License");
screamer 0:ea30ba97a865 7 // you may not use this file except in compliance with the License.
screamer 0:ea30ba97a865 8 // You may obtain a copy of the License at
screamer 0:ea30ba97a865 9 //
screamer 0:ea30ba97a865 10 // http://www.apache.org/licenses/LICENSE-2.0
screamer 0:ea30ba97a865 11 //
screamer 0:ea30ba97a865 12 // Unless required by applicable law or agreed to in writing, software
screamer 0:ea30ba97a865 13 // distributed under the License is distributed on an "AS IS" BASIS,
screamer 0:ea30ba97a865 14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
screamer 0:ea30ba97a865 15 // See the License for the specific language governing permissions and
screamer 0:ea30ba97a865 16 // limitations under the License.
screamer 0:ea30ba97a865 17 // ----------------------------------------------------------------------------
screamer 0:ea30ba97a865 18 #ifndef MBED_TEST_MODE
screamer 0:ea30ba97a865 19
screamer 0:ea30ba97a865 20 #include "mbed.h"
screamer 0:ea30ba97a865 21 #include "simple-mbed-cloud-client.h"
screamer 0:ea30ba97a865 22 #include "FATFileSystem.h"
screamer 1:37392c1b4cf8 23 #include "LittleFileSystem.h"
screamer 0:ea30ba97a865 24
screamer 13:433fcff306ad 25 // Default network interface object. Don't forget to change the WiFi SSID/password in mbed_app.json if you're using WiFi.
screamer 0:ea30ba97a865 26 NetworkInterface *net = NetworkInterface::get_default_instance();
screamer 0:ea30ba97a865 27
screamer 7:24d524c2bdcc 28 // Default block device available on the target board
screamer 1:37392c1b4cf8 29 BlockDevice *bd = BlockDevice::get_default_instance();
screamer 7:24d524c2bdcc 30
screamer 7:24d524c2bdcc 31 #if COMPONENT_SD || COMPONENT_NUSD
screamer 7:24d524c2bdcc 32 // Use FATFileSystem for SD card type blockdevices
screamer 23:64f3f756acf6 33 FATFileSystem fs("fs");
screamer 7:24d524c2bdcc 34 #else
screamer 7:24d524c2bdcc 35 // Use LittleFileSystem for non-SD block devices to enable wear leveling and other functions
screamer 23:64f3f756acf6 36 LittleFileSystem fs("fs");
screamer 7:24d524c2bdcc 37 #endif
screamer 0:ea30ba97a865 38
screamer 1:37392c1b4cf8 39 // Default User button for GET example
screamer 4:05845431da95 40 InterruptIn button(BUTTON1);
screamer 1:37392c1b4cf8 41 // Default LED to use for PUT/POST example
screamer 1:37392c1b4cf8 42 DigitalOut led(LED1);
screamer 7:24d524c2bdcc 43 // Temperature reading from microcontroller
screamer 1:37392c1b4cf8 44 AnalogIn adc_temp(ADC_TEMP);
screamer 7:24d524c2bdcc 45 // Voltage reference reading from microcontroller
screamer 1:37392c1b4cf8 46 AnalogIn adc_vref(ADC_VREF);
screamer 0:ea30ba97a865 47
screamer 1:37392c1b4cf8 48 #define SENSORS_POLL_INTERVAL 1.0
screamer 0:ea30ba97a865 49
screamer 19:7e760f65ed78 50 // Declaring pointers for access to Pelion Device Management Client resources outside of main()
screamer 19:7e760f65ed78 51 MbedCloudClientResource *button_res;
screamer 19:7e760f65ed78 52 MbedCloudClientResource *led_res;
screamer 19:7e760f65ed78 53 MbedCloudClientResource *post_res;
screamer 1:37392c1b4cf8 54
screamer 19:7e760f65ed78 55 MbedCloudClientResource *temp_res;
screamer 19:7e760f65ed78 56 MbedCloudClientResource *volt_res;
screamer 19:7e760f65ed78 57
screamer 19:7e760f65ed78 58
screamer 19:7e760f65ed78 59 // An event queue is a very useful structure to debounce information between contexts (e.g. ISR and normal threads)
screamer 19:7e760f65ed78 60 // 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
screamer 19:7e760f65ed78 61 EventQueue eventQueue;
screamer 0:ea30ba97a865 62
screamer 0:ea30ba97a865 63 /**
screamer 19:7e760f65ed78 64 * PUT handler - sets the value of the built-in LED
screamer 0:ea30ba97a865 65 * @param resource The resource that triggered the callback
screamer 0:ea30ba97a865 66 * @param newValue Updated value for the resource
screamer 0:ea30ba97a865 67 */
screamer 19:7e760f65ed78 68 void put_callback(MbedCloudClientResource *resource, m2m::String newValue) {
screamer 11:0bddeb20bafc 69 printf("PUT received. New value: %s\n", newValue.c_str());
screamer 1:37392c1b4cf8 70 led = atoi(newValue.c_str());
screamer 0:ea30ba97a865 71 }
screamer 0:ea30ba97a865 72
screamer 0:ea30ba97a865 73 /**
screamer 19:7e760f65ed78 74 * POST handler - prints the content of the payload
screamer 0:ea30ba97a865 75 * @param resource The resource that triggered the callback
screamer 0:ea30ba97a865 76 * @param buffer If a body was passed to the POST function, this contains the data.
screamer 0:ea30ba97a865 77 * Note that the buffer is deallocated after leaving this function, so copy it if you need it longer.
screamer 0:ea30ba97a865 78 * @param size Size of the body
screamer 0:ea30ba97a865 79 */
screamer 19:7e760f65ed78 80 void post_callback(MbedCloudClientResource *resource, const uint8_t *buffer, uint16_t size) {
screamer 19:7e760f65ed78 81 printf("POST received (length %u). Payload: ", size);
screamer 19:7e760f65ed78 82 for (size_t ix = 0; ix < size; ix++) {
screamer 19:7e760f65ed78 83 printf("%02x ", buffer[ix]);
screamer 19:7e760f65ed78 84 }
screamer 19:7e760f65ed78 85 printf("\n");
screamer 1:37392c1b4cf8 86 }
screamer 0:ea30ba97a865 87
screamer 1:37392c1b4cf8 88 /**
screamer 19:7e760f65ed78 89 * Button handler
screamer 19:7e760f65ed78 90 * This function will be triggered either by a physical button press or by a ticker every 5 seconds (see below)
screamer 1:37392c1b4cf8 91 */
screamer 1:37392c1b4cf8 92 void button_press() {
screamer 19:7e760f65ed78 93 int v = button_res->get_value_int() + 1;
screamer 19:7e760f65ed78 94 button_res->set_value(v);
screamer 1:37392c1b4cf8 95 printf("Button clicked %d times\n", v);
screamer 0:ea30ba97a865 96 }
screamer 0:ea30ba97a865 97
screamer 0:ea30ba97a865 98 /**
screamer 0:ea30ba97a865 99 * Notification callback handler
screamer 0:ea30ba97a865 100 * @param resource The resource that triggered the callback
screamer 0:ea30ba97a865 101 * @param status The delivery status of the notification
screamer 0:ea30ba97a865 102 */
screamer 0:ea30ba97a865 103 void button_callback(MbedCloudClientResource *resource, const NoticationDeliveryStatus status) {
screamer 0:ea30ba97a865 104 printf("Button notification, status %s (%d)\n", MbedCloudClientResource::delivery_status_to_string(status), status);
screamer 0:ea30ba97a865 105 }
screamer 0:ea30ba97a865 106
screamer 0:ea30ba97a865 107 /**
screamer 0:ea30ba97a865 108 * Registration callback handler
screamer 0:ea30ba97a865 109 * @param endpoint Information about the registered endpoint such as the name (so you can find it back in portal)
screamer 19:7e760f65ed78 110 * When the device is registered, this variable will be used to access various useful information, like device ID etc.
screamer 0:ea30ba97a865 111 */
screamer 19:7e760f65ed78 112
screamer 19:7e760f65ed78 113 static const ConnectorClientEndpointInfo* endpointInfo;
screamer 0:ea30ba97a865 114 void registered(const ConnectorClientEndpointInfo *endpoint) {
screamer 7:24d524c2bdcc 115 printf("Registered to Pelion Device Management. Endpoint Name: %s\n", endpoint->internal_endpoint_name.c_str());
screamer 1:37392c1b4cf8 116 endpointInfo = endpoint;
screamer 0:ea30ba97a865 117 }
screamer 0:ea30ba97a865 118
screamer 1:37392c1b4cf8 119 /**
screamer 1:37392c1b4cf8 120 * Update sensors and report their values.
screamer 1:37392c1b4cf8 121 * This function is called periodically.
screamer 1:37392c1b4cf8 122 */
screamer 1:37392c1b4cf8 123 void sensors_update() {
screamer 1:37392c1b4cf8 124 float temp = adc_temp.read()*100;
screamer 1:37392c1b4cf8 125 float vref = adc_vref.read();
screamer 1:37392c1b4cf8 126 printf("ADC temp: %6.4f C, vref: %6.4f %%\r\n", temp, vref);
screamer 1:37392c1b4cf8 127 if (endpointInfo) {
screamer 19:7e760f65ed78 128 temp_res->set_value(temp);
screamer 19:7e760f65ed78 129 volt_res->set_value(vref);
screamer 1:37392c1b4cf8 130 }
screamer 1:37392c1b4cf8 131 }
screamer 1:37392c1b4cf8 132
screamer 1:37392c1b4cf8 133
screamer 0:ea30ba97a865 134 int main(void) {
screamer 8:579904ba4ba1 135 printf("\nStarting Simple Pelion Device Management Client example\n");
screamer 1:37392c1b4cf8 136
screamer 23:64f3f756acf6 137 int storage_status = fs.mount(bd);
screamer 23:64f3f756acf6 138 if (storage_status != 0) {
screamer 23:64f3f756acf6 139 printf("Storage mounting failed.\n");
screamer 23:64f3f756acf6 140 }
screamer 23:64f3f756acf6 141
screamer 23:64f3f756acf6 142 #if USE_BUTTON == 1
screamer 1:37392c1b4cf8 143 // If the User button is pressed ons start, then format storage.
screamer 23:64f3f756acf6 144 bool btn_pressed = (button.read() == MBED_CONF_APP_BUTTON_PRESSED_STATE);
screamer 23:64f3f756acf6 145 if (btn_pressed) {
screamer 23:64f3f756acf6 146 printf("User button is pushed on start...\n");
screamer 23:64f3f756acf6 147 }
screamer 23:64f3f756acf6 148 #else
screamer 23:64f3f756acf6 149 bool btn_pressed = FALSE;
screamer 23:64f3f756acf6 150 #endif /* USE_BUTTON */
screamer 23:64f3f756acf6 151
screamer 23:64f3f756acf6 152 if (storage_status || btn_pressed) {
screamer 23:64f3f756acf6 153 printf("Formatting the storage...\n");
screamer 23:64f3f756acf6 154 int storage_status = StorageHelper::format(&fs, bd);
screamer 1:37392c1b4cf8 155 if (storage_status != 0) {
screamer 23:64f3f756acf6 156 printf("ERROR: Failed to reformat the storage (%d).\n", storage_status);
screamer 1:37392c1b4cf8 157 }
screamer 8:579904ba4ba1 158 } else {
screamer 8:579904ba4ba1 159 printf("You can hold the user button during boot to format the storage and change the device identity.\n");
screamer 1:37392c1b4cf8 160 }
screamer 0:ea30ba97a865 161
screamer 19:7e760f65ed78 162 // Connect to the Internet (DHCP is expected to be on)
screamer 10:f3ec71d2ec83 163 printf("Connecting to the network using the default network interface...\n");
screamer 1:37392c1b4cf8 164 net = NetworkInterface::get_default_instance();
screamer 0:ea30ba97a865 165
screamer 19:7e760f65ed78 166 nsapi_error_t net_status = NSAPI_ERROR_NO_CONNECTION;
screamer 19:7e760f65ed78 167 while ((net_status = net->connect()) != NSAPI_ERROR_OK) {
screamer 19:7e760f65ed78 168 printf("Unable to connect to network (%d). Retrying...\n", net_status);
screamer 0:ea30ba97a865 169 }
screamer 0:ea30ba97a865 170
screamer 0:ea30ba97a865 171 printf("Connected to the network successfully. IP address: %s\n", net->get_ip_address());
screamer 0:ea30ba97a865 172
screamer 8:579904ba4ba1 173 printf("Initializing Pelion Device Management Client...\n");
screamer 7:24d524c2bdcc 174
screamer 19:7e760f65ed78 175 // SimpleMbedCloudClient handles registering over LwM2M to Pelion Device Management
screamer 0:ea30ba97a865 176 SimpleMbedCloudClient client(net, bd, &fs);
screamer 0:ea30ba97a865 177 int client_status = client.init();
screamer 0:ea30ba97a865 178 if (client_status != 0) {
screamer 19:7e760f65ed78 179 printf("Pelion Client initialization failed (%d)\n", client_status);
screamer 0:ea30ba97a865 180 return -1;
screamer 0:ea30ba97a865 181 }
screamer 0:ea30ba97a865 182
screamer 0:ea30ba97a865 183 // Creating resources, which can be written or read from the cloud
screamer 19:7e760f65ed78 184 button_res = client.create_resource("3200/0/5501", "button_count");
screamer 19:7e760f65ed78 185 button_res->set_value(0);
screamer 19:7e760f65ed78 186 button_res->methods(M2MMethod::GET);
screamer 19:7e760f65ed78 187 button_res->observable(true);
screamer 19:7e760f65ed78 188 button_res->attach_notification_callback(button_callback);
screamer 1:37392c1b4cf8 189
screamer 19:7e760f65ed78 190 led_res = client.create_resource("3201/0/5853", "led_state");
screamer 19:7e760f65ed78 191 led_res->set_value(led.read());
screamer 19:7e760f65ed78 192 led_res->methods(M2MMethod::GET | M2MMethod::PUT);
screamer 19:7e760f65ed78 193 led_res->attach_put_callback(put_callback);
screamer 19:7e760f65ed78 194
screamer 19:7e760f65ed78 195 post_res = client.create_resource("3300/0/5605", "execute_function");
screamer 19:7e760f65ed78 196 post_res->methods(M2MMethod::POST);
screamer 19:7e760f65ed78 197 post_res->attach_post_callback(post_callback);
screamer 0:ea30ba97a865 198
screamer 1:37392c1b4cf8 199 // Sensor resources
screamer 19:7e760f65ed78 200 temp_res = client.create_resource("3303/0/5700", "temperature");
screamer 19:7e760f65ed78 201 temp_res->set_value(0);
screamer 19:7e760f65ed78 202 temp_res->methods(M2MMethod::GET);
screamer 19:7e760f65ed78 203 temp_res->observable(true);
screamer 0:ea30ba97a865 204
screamer 19:7e760f65ed78 205 volt_res = client.create_resource("3316/0/5700", "voltage");
screamer 19:7e760f65ed78 206 volt_res->set_value(0);
screamer 19:7e760f65ed78 207 volt_res->methods(M2MMethod::GET);
screamer 19:7e760f65ed78 208 volt_res->observable(true);
screamer 0:ea30ba97a865 209
screamer 11:0bddeb20bafc 210 printf("Initialized Pelion Device Management Client. Registering...\n");
screamer 0:ea30ba97a865 211
screamer 0:ea30ba97a865 212 // Callback that fires when registering is complete
screamer 0:ea30ba97a865 213 client.on_registered(&registered);
screamer 0:ea30ba97a865 214
screamer 1:37392c1b4cf8 215 // Register with Pelion DM
screamer 0:ea30ba97a865 216 client.register_and_connect();
screamer 0:ea30ba97a865 217
screamer 19:7e760f65ed78 218 // The button fires on an interrupt context, but debounces it to the eventqueue, so it's safe to do network operations
screamer 1:37392c1b4cf8 219 button.fall(eventQueue.event(&button_press));
screamer 14:1ac188d5404d 220 printf("Press the user button to increment the LwM2M resource value...\n");
screamer 1:37392c1b4cf8 221
screamer 0:ea30ba97a865 222 Ticker timer;
screamer 1:37392c1b4cf8 223 timer.attach(eventQueue.event(&sensors_update), SENSORS_POLL_INTERVAL);
screamer 0:ea30ba97a865 224
screamer 0:ea30ba97a865 225 // You can easily run the eventQueue in a separate thread if required
screamer 0:ea30ba97a865 226 eventQueue.dispatch_forever();
screamer 0:ea30ba97a865 227 }
screamer 19:7e760f65ed78 228
screamer 19:7e760f65ed78 229 #endif /* MBED_TEST_MODE */