
Simple Mbed Cloud Client application using features of K64 & K66
Connect to Mbed Cloud!
This example was customized a bit for FRDM-K66 and FRDM-K64F.
It depends on having an SD Card plugged in for storage of credentials. It could be changed later to use a SPI flash or other storage on a shield or wired in.
The app keeps track of how many times switch 2 (SW2) is pressed. The value can be retrieved via a GET request to Mbed Cloud.
Also, it will blink a pattern based on milisecond (ms) timing values that can be sent from Mbed Cloud. The pattern can be sent with a PUT request and the blinking sequence can be triggered by a POST request.
Revision 10:3f30c0e55a8e, committed 2018-05-10
- Comitter:
- maclobdell
- Date:
- Thu May 10 06:28:36 2018 -0500
- Parent:
- 9:ae1f6fe932dc
- Child:
- 11:6669e1e62d6f
- Commit message:
- add license, readme, resources file
Changed in this revision
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/README.md Thu May 10 06:28:36 2018 -0500 @@ -0,0 +1,369 @@ +# Simple Mbed Cloud Client template application + +## Overview + +This is a template application for platform vendors. It demonstrates how to create a simple Mbed Cloud Client application that can connect to Mbed Cloud, register resources and get ready to receive a firmware update. + +It's intended to be customized to add platform-specific features (such as sensors and actuators) and configure the connectivity and storage to work **out-of-the-box**. The Simple Mbed Cloud Client template application works in **developer mode** by default. + +## Setup process + +This is a summary of the process for developers to get started and get a device connected to Mbed Cloud. + +### Mbed Online IDE + +1. Import the application into the Online IDE. +2. Add the API key to establish connection to Mbed Cloud. +3. Install the developer certificate. +4. Compile and program. + +### Mbed CLI tools + +1. Import the application in developer's desktop: + + ``` + mbed import https://os.mbed.com/teams/mbed-os-examples/code/mbed-cloud-example + cd mbed-cloud-example + ``` + +2. Download the developer certificate from Mbed Cloud. +3. Compile and program: + + ``` + mbed compile -t <toolchain> -m <target> -f + ``` + +## Porting to a new platform + +### Requirements + +The hardware requirements for Mbed OS platforms to support Mbed Cloud Client are [here](https://cloud.mbed.com/docs/current/cloud-requirements/index.html). + +In general, to start creating a secure connected product, you need a microcontroller that has the following features. +* RAM: 96K or more +* Flash: 512K or more +* True Random Number Generator (TRNG) +* Real Time Clock (RTC) + +Additionally, to use Mbed Cloud Client, the microcontroller needs to support the following in Mbed OS (latest version preferred) or in a compatible driver library: +* A storage device (SDcard, SPI Flash, Data Flash) +* IP connectivity (Ethernet, WiFi, Cellular, 6LoWPAN, Thread) + +For the Firmware update over the air (FOTA), you need the following: +* [FlashIAP](https://github.com/ARMmbed/mbed-os/blob/master/drivers/FlashIAP.h) - Flash In-Application Programming (IAP) +* [Mbed Bootloader](https://github.com/ARMmbed/mbed-bootloader) or a bootloader compatible with Mbed Cloud Client. + +### References + +* Check which Mbed OS platforms are supported in the [Mbed Cloud quick-start guide](https://cloud.test.mbed.com/quick-start). +* Check which storage options are available [here](https://os.mbed.com/docs/v5.8/reference/storage.html). +* Check which network options are available [here](https://os.mbed.com/docs/v5.8/reference/network-socket.html). + + +### Porting steps + +Supporting a new derivative platform requires the following steps: + +* Fork the template and create an example application for your platform in https://os.mbed.com. +* (Optional) Change the connectivity interface. Ethernet is the default - see `main.cpp`. +* (Optional) Change the filesystem and/or the block device for storage. FAT filesystem over SD card is the default. See `main.cpp`. +* (Optional) Make minor changes in `mbed_app.json` to support multiple platforms with same connectivity and storage. + +<span class="notes">**Note:** Make sure that the application works out-of-the-box and no changes are required in the `main.cpp` file. The goal is to deliver a great UX to our developers.</span> + +### Porting example + +In this example, an app with an SD card and on-chip Ethernet is taken to a custom board that has an MCU + Wi-Fi module. + +#### Changing the storage option + +##### For an SD card + +1. Add the SD card driver (`sd-driver.lib`) if it is not already added. + + On the command line: + + ``` + mbed add https://github.com/armmbed/sd-driver + ``` + +2. In the online compiler, click **Import**, then click here to import from URL. +3. Then enter https://github.com/armmbed/sd-driver for the **Source URL** and **Import As:** Library. +4. Include the header files for the SD driver and FAT file system: + + ```cpp + #include "SDBlockDevice.h" + #include "FATFileSystem.h" + ``` + +5. Declare the global objects for the SD card and file system. + + ```cpp + SDBlockDevice bd(SPI_MOSI, SPI_MISO, SPI_CLK, SPI_CS); + FATFileSystem fs("sd", &sd); + ``` + +<span class="notes">**Note:** The `SPI_*` macros represent the pin names. The names can be defined in a variety of places including the sd-driver, your project’s configuration file (`mbed_app.json`) or the `pinnames.h` file for the target that defines the default pin names. You can use other pin names depending on the platform and the connections.</span> + +For example, if the SPI signals for the SD card interface are connected on an Arduino compatible shield, you may define them like this: + +```cpp +SDBlockDevice sd(D11, D12, D13, D10); +``` + +##### For SPI Flash (devices that support SFDP) + +<Please note that this section of the document is under construction. More information is needed.> + +1. Add the SPI Flash driver (`spif-driver`) if it is not already added. + + ``` + mbed add https://github.com/ARMmbed/spif-driver + ``` + +2. Include the header files for the SPI Flash driver and LitteFS file system. For SPI Flash, we recommend LittleFS file system which supports wear leveling. + + ```cpp + #include "SPIFBlockDevice.h" + #include "LittleFileSystem.h" + ``` + +3. Declare the global objects for the SD card and file system: + + ```cpp + SPIFBlockDevice spif(SPI_MOSI, SPI_MISO, SPI_CLK, SPI_CS); + LittleFileSystem fs("fs", &spif); + ``` + +4. Update the construction of the `SimpleMbedCloudClient` object to pass in the file system and block device: + + ```cpp + SimpleMbedCloudClient client(&net, &spif, &fs); + ``` + +#### Changing the network interface + +##### For Ethernet + +The Ethernet interface is included within Mbed OS, so you do not need to add a library. + +1. Include the header file for the interface. + + ``` + #include "EthernetInterface.h" + ``` + +2. Declare the network interface object. + + ``` + EthernetInterface net; + ``` + +3. Connect the interface. + + ``` + status = net.connect(); + ``` + +4. When the Mbed Cloud Client is started, pass the network interface. + + ``` + SimpleMbedCloudClient client(&net, &sd, &fs); + ``` + +##### For WiFi + +This example references the ESP8266 WiFi module, but the instructions are applicable to other modules. + +1. Add the ESP8266 WiFi interface driver (esp8266-driver) if it is not already added. + + ``` + Mbed add https://github.com/ARMmbed/esp8266-driver + ``` + + <span class="notes">**Note:** You may have to update the firmware inside the ESP8266 module.</span> + +2. Include the header file for the interface. + + ```cpp + #include "ESP8266Interface.h" + ``` + +3. Add the driver configuration information in `mbed_app.json` (located at the top level of the Mbed Cloud Connect example project). + + ```json + "config": { + "wifi-ssid": { + "help": "WiFi SSID", + "value": "\"SSID\"" + }, + "wifi-password": { + "help": "WiFi Password", + "value": "\"PASSWORD\"" + } + } + ``` + +4. Declare the network interface object. + + ```cpp + ESP8266Interface net(D1, D0); + ``` + +5. Connect the interface. + + ```cpp + nsapi_error_t status = net.connect(MBED_CONF_APP_WIFI_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA_WPA2); + ``` + +6. When the Mbed Cloud Client is started, pass the network interface. + + ```cpp + SimpleMbedCloudClient client(&net, &sd, &fs); + ``` + +#### Changing the target MCU + +To change the target board to another board that is supported by Mbed OS, simply change the target name. + +##### Using the command line + +Use the -m option. + +``` +mbed compile -m Hexiwear -t GCC_ARM +``` + +##### Using the online compiler + +Click the platform name on the top right corner, then select another platform. + +##### Using an IDE + +First re-export (create project files) for the target with the command line. + +``` +mbed export -m Hexiwear -i uvision +``` + +#### Creating a custom target board + +Read the Mbed OS [Contributing](https://os.mbed.com/docs/latest/reference/porting-targets.html) documentation on how to add a new target. + +#### Update the application logic + +The template example uses a ticker object to periodically fire a software interrupt to simulate button presses. Let’s say you want to make an actual button press. + +By default, there is a Ticker object, which fires every five seconds and invokes a callback function. + +```cpp +Ticker timer; +timer.attach(eventQueue.event(&fake_button_press), 5.0); +``` + +This callback function changes the `button_res` resource: + +```cpp +void fake_button_press() { + int v = button_res->get_value_int() + 1; + + button_res->set_value(v); + + printf("Simulated button clicked %d times\n", v); +} +``` + +If you want to change this to an actual button, here is how to do it: + +1. Remove: + + ```cpp + Ticker timer; + timer.attach(eventQueue.event(&fake_button_press), 5.0); + ``` + +1. Declare an `InterruptIn` object on the button, and attach the callback function to the `fall` handler: + + ```cpp + InterruptIn btn(BUTTON1); + btn.fall(eventQueue.event(&fake_button_press), 5.0); + ``` + +1. Rename `fake_button_press` to `real_button_press`. + + +#### Updating the LwM2M objects + +See guide at [TODO] + +## Enabling firmware updates + +To enable firmware updates, a compatible bootloader needs to be added in the `tools/` folder. The process to merge the application with the bootloader currently only works when building with Mbed CLI. In the future, this combine process will be done automatically by Mbed tools. + +1. Compile [mbed-bootloader](https://github.com/armmbed/mbed-bootloader) for the platform and storage configuration used in this application. Place the binary in the tools folder. + +1. Add a section to `mbed_app.json` under `target_overrides` with the bootloader configuration. For example: + + ```json + "K64F": { + "target.mbed_app_start" : "0x0000a400", + "update-client.bootloader-details" : "0x00007188", + "sotp-section-1-address" : "(32*1024)", + "sotp-section-1-size" : "( 4*1024)", + "sotp-section-2-address" : "(36*1024)", + "sotp-section-2-size" : "( 4*1024)", + "update-client.application-details": "(40*1024)" + } + ``` + +Next, instruct your users to do the following: + +1. Install the [manifest tool](https://github.com/armmbed/manifest-tool). +1. Generate an update certificate: + + ``` + $ manifest-tool init -a YOUR_MBED_CLOUD_API_KEY -d yourdomain.com -m device-model-id -q --force + ``` + + <span class="notes">**Note:** Make sure to replace `YOUR_MBED_CLOUD_API_KEY` with an Mbed Cloud API key. + +1. Build the application and combine it with the bootloader: + + ``` + $ mbed compile -m YOUR_TARGET -t GCC_ARM + $ tools/combine_bootloader_with_app.py -m YOUR_TARGET -a BUILD/YOUR_TARGET/GCC_ARM/simple-mbed-cloud-client-example_application.bin -o combined.bin + ``` + +1. Flash `combined.bin` to the development board. +1. Write down the endpoint ID of the board. You need it to start the update. + +Now, a firmware update can be scheduled as explained in the [Mbed Cloud documentation](https://cloud.mbed.com/docs/current/updating-firmware/index.html). You can do it with the manifest tool itself or via the Mbed Cloud portal. Here we explain how to do it with the manifest tool. + +1. Change the application, for example by changing some strings in `main.cpp`. +1. Compile the application: + + ``` + $ mbed compile -m YOUR_TARGET -t GCC_ARM + ``` + +1. The manifest tool can both sign the update - using the private key generated earlier - and upload it to Mbed Cloud in a single command. Run: + + ``` + $ manifest-tool update device -p BUILD/YOUR_BOARD_NAME/GCC_ARM/simple-mbed-cloud-client-example_application.bin -D YOUR_ENDPOINT_NAME + ``` + + Replace `YOUR_BOARD_NAME` with the name of your development board, and replace `YOUR_ENDPOINT_NAME` with the endpoint name in Mbed Cloud. + +1. Inspect the logs on the device to see the update progress. It looks similar to: + + ``` + Firmware download requested + Authorization granted + Downloading: [+++- ] 6 % + ``` + +1. When the download completes, the firmware is verified. If everything is OK, the firmware update is applied. + +## Known issues + +Please check the issues reported on github.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/update_default_resources.c Thu May 10 06:28:36 2018 -0500 @@ -0,0 +1,41 @@ +// ---------------------------------------------------------------------------- +// Copyright 2016-2018 ARM Ltd. +// +// SPDX-License-Identifier: Apache-2.0 +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// ---------------------------------------------------------------------------- + +#ifdef MBED_CLOUD_CLIENT_USER_CONFIG_FILE +#include MBED_CLOUD_CLIENT_USER_CONFIG_FILE +#endif + +#include <stdint.h> + +#ifdef MBED_CLOUD_DEV_UPDATE_ID +const uint8_t arm_uc_vendor_id[16] = { "dev_manufacturer" }; +const uint16_t arm_uc_vendor_id_size = sizeof(arm_uc_vendor_id); + +const uint8_t arm_uc_class_id[16] = { "dev_model_number" }; +const uint16_t arm_uc_class_id_size = sizeof(arm_uc_class_id); +#endif + +#ifdef MBED_CLOUD_DEV_UPDATE_CERT +const uint8_t arm_uc_default_fingerprint[32] = { 0 }; +const uint16_t arm_uc_default_fingerprint_size = + sizeof(arm_uc_default_fingerprint); + +const uint8_t arm_uc_default_certificate[1] = { 0 }; +const uint16_t arm_uc_default_certificate_size = + sizeof(arm_uc_default_certificate); +#endif