Mbed Client sample for GR-LYCHEE where ZXing is incorporated.

Dependencies:   DisplayApp AsciiFont

Fork of GR-PEACH_mbed-os-client-ZXingSample by Renesas


This sample program shows how to use mbed Client together with ZXing which is an open-source, multi-format 1D/2D barcode image processing library. For more info on ZXing, please refer to https://github.com/zxing/zxing.

Required hardware

Application setup

  1. Select the connection type. For details, please refer to the following wiki:
  2. Set the client credentials. For details, please refer to the following wiki:
  3. Change Wifi settings. For details, please refer to the following wiki:

Building the example

To build this example:

  1. Import this example onto mbed Compiler.
  2. Configure the example in accordance with Application setup.
  3. Compile the example on mbed Compiler and download the resultant binary file.
  4. Plug the micro-USB cable into the OpenSDA port which lies on the next to the RESET button.
  5. Copy the binary previously downloaded to your PC to GR-LYCHEE to flash this example. When the copy is successfully completed, the board is ready to work.
  6. Press the RESET button on the board to run the example.
  7. For verification, please refer to the following wiki:

Application resources

This example exposes four resources listed below:

  1. 3202/0/5700. Decode result of barcode data input from camera (GET).
  2. 3201/0/5850. Blink function, blinks LED when executed (POST).
  3. 3201/0/5853. Blink pattern, used by the blink function to determine how to blink. In the format of 1000:500:1000:500:1000:500 (PUT).
  4. 3201/0/5855. Blink color, used by the blink function. Any of green, yellow, orange and red is acceptable (PUT).


20 months ago

File content as of revision 22:a3cd35c5cff0:

 * Copyright (c) 2015 ARM Limited. All rights reserved.
 * 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.

#ifndef __SIMPLECLIENT_H__
#define __SIMPLECLIENT_H__

#include "mbed-client/m2minterfacefactory.h"
#include "mbed-client/m2mdevice.h"
#include "mbed-client/m2minterfaceobserver.h"
#include "mbed-client/m2minterface.h"
#include "mbed-client/m2mobject.h"
#include "mbed-client/m2mobjectinstance.h"
#include "mbed-client/m2mresource.h"
#include "mbed-client/m2mconfig.h"
#include "mbed-client/m2mblockmessage.h"
#include "security.h"
#include "mbed.h"

#define STRINGIFY(s) #s

// EASY_CONNECT_MESH coming via easy-connect
    // Mesh is always IPV6 - also WiFi and ETH can be IPV6 if IPV6 is enabled
    M2MInterface::NetworkStack NETWORK_STACK = M2MInterface::LwIP_IPv6;
    // Everything else - we assume it's IPv4
    M2MInterface::NetworkStack NETWORK_STACK = M2MInterface::LwIP_IPv4;

//Select binding mode: UDP or TCP -- note - Mesh networking is IPv6 UDP ONLY
#if defined (EASY_CONNECT_MESH)
    M2MInterface::BindingMode SOCKET_MODE = M2MInterface::UDP;
    // WiFi or Ethernet supports both - TCP by default to avoid
    // NAT problems, but UDP will also work - IF you configure
    // your network right.
    M2MInterface::BindingMode SOCKET_MODE = M2MInterface::TCP;

// from the security.h file copied from connector.mbed.com

struct MbedClientDevice {
    const char* Manufacturer;
    const char* Type;
    const char* ModelNumber;
    const char* SerialNumber;

* Wrapper for mbed client stack that handles all callbacks, error handling, and
* other shenanigans to make the mbed client stack easier to use.
* The end user should only have to care about configuring the parameters at the
* top of this file and making sure they add the security.h file correctly.
* To add resources you can copy the _TODO__ function and add as many instances as
* you want.
class MbedClient: public M2MInterfaceObserver {

    // constructor for MbedClient object, initialize private variables
    MbedClient(struct MbedClientDevice device) {
        _interface = NULL;
        _bootstrapped = false;
        _error = false;
        _registered = false;
        _unregistered = false;
        _register_security = NULL;
        _value = 0;
        _object = NULL;
        _device = device;

    // de-constructor for MbedClient object, you can ignore this
    ~MbedClient() {
        if(_interface) {
            delete _interface;
            delete _register_security;

    // debug printf function
    void trace_printer(const char* str) {
        printf("\r\n%s\r\n", str);

    *  Creates M2MInterface using which endpoint can
    *  setup its name, resource type, life time, connection mode,
    *  Currently only LwIPv4 is supported.
    void create_interface(const char *server_address,
                          void *handler=NULL) {
    // Randomizing listening port for Certificate mode connectivity
    _server_address = server_address;
    uint16_t port = 0; // Network interface will randomize with port 0

    // create mDS interface object, this is the base object everything else attaches to
    _interface = M2MInterfaceFactory::create_interface(*this,
                                                      MBED_ENDPOINT_NAME,       // endpoint name string
                                                      "test",                   // endpoint type string
                                                      100,                      // lifetime
                                                      port,                     // listen port
                                                      MBED_DOMAIN,              // domain string
                                                      SOCKET_MODE,              // binding mode
                                                      NETWORK_STACK,            // network stack
                                                      "");                      // context address string
    const char *binding_mode = (SOCKET_MODE == M2MInterface::UDP) ? "UDP" : "TCP";
    printf("\r\nSOCKET_MODE : %s\r\n", binding_mode);
    printf("Connecting to %s\r\n", server_address);

    if(_interface) {


    *  check private variable to see if the registration was sucessful or not
    bool register_successful() {
        return _registered;

    *  check private variable to see if un-registration was sucessful or not
    bool unregister_successful() {
        return _unregistered;

    *  Creates register server object with mbed device server address and other parameters
    *  required for client to connect to mbed device server.
    M2MSecurity* create_register_object() {
        // create security object using the interface factory.
        // this will generate a security ObjectID and ObjectInstance
        M2MSecurity *security = M2MInterfaceFactory::create_security(M2MSecurity::M2MServer);

        // make sure security ObjectID/ObjectInstance was created successfully
        if(security) {
            // Add ResourceID's and values to the security ObjectID/ObjectInstance
            security->set_resource_value(M2MSecurity::M2MServerUri, _server_address);
            security->set_resource_value(M2MSecurity::SecurityMode, M2MSecurity::Certificate);
            security->set_resource_value(M2MSecurity::ServerPublicKey, SERVER_CERT, sizeof(SERVER_CERT) - 1);
            security->set_resource_value(M2MSecurity::PublicKey, CERT, sizeof(CERT) - 1);
            security->set_resource_value(M2MSecurity::Secretkey, KEY, sizeof(KEY) - 1);
        return security;

    * Creates device object which contains mandatory resources linked with
    * device endpoint.
    M2MDevice* create_device_object() {
        // create device objectID/ObjectInstance
        M2MDevice *device = M2MInterfaceFactory::create_device();
        // make sure device object was created successfully
        if(device) {
            // add resourceID's to device objectID/ObjectInstance
            device->create_resource(M2MDevice::Manufacturer, _device.Manufacturer);
            device->create_resource(M2MDevice::DeviceType, _device.Type);
            device->create_resource(M2MDevice::ModelNumber, _device.ModelNumber);
            device->create_resource(M2MDevice::SerialNumber, _device.SerialNumber);
        return device;

    * register an object
    void test_register(M2MSecurity *register_object, M2MObjectList object_list){
        if(_interface) {
            // Register function
            _interface->register_object(register_object, object_list);

    * unregister all objects
    void test_unregister() {
        if(_interface) {
            // Unregister function
            _interface->unregister_object(NULL); // NULL will unregister all objects

    //Callback from mbed client stack when the bootstrap
    // is successful, it returns the mbed Device Server object
    // which will be used for registering the resources to
    // mbed Device server.
    void bootstrap_done(M2MSecurity *server_object){
        if(server_object) {
            _bootstrapped = true;
            _error = false;

    //Callback from mbed client stack when the registration
    // is successful, it returns the mbed Device Server object
    // to which the resources are registered and registered objects.
    void object_registered(M2MSecurity */*security_object*/, const M2MServer &/*server_object*/){
        _registered = true;
        _unregistered = false;
        trace_printer("Registered object successfully!");

    //Callback from mbed client stack when the unregistration
    // is successful, it returns the mbed Device Server object
    // to which the resources were unregistered.
    void object_unregistered(M2MSecurity */*server_object*/){
        trace_printer("Unregistered Object Successfully");
        _unregistered = true;
        _registered = false;

    * Callback from mbed client stack when registration is updated
    void registration_updated(M2MSecurity */*security_object*/, const M2MServer & /*server_object*/){
        /* The registration is updated automatically and frequently by the
        *  mbed client stack. This print statement is turned off because it
        *  tends to happen alot.
        //trace_printer("\r\nRegistration Updated\r\n");

    // Callback from mbed client stack if any error is encountered
    // during any of the LWM2M operations. Error type is passed in
    // the callback.
    void error(M2MInterface::Error error){
        _error = true;
            case M2MInterface::AlreadyExists:
                trace_printer("[ERROR:] M2MInterface::AlreadyExist");
            case M2MInterface::BootstrapFailed:
                trace_printer("[ERROR:] M2MInterface::BootstrapFailed");
            case M2MInterface::InvalidParameters:
                trace_printer("[ERROR:] M2MInterface::InvalidParameters");
            case M2MInterface::NotRegistered:
                trace_printer("[ERROR:] M2MInterface::NotRegistered");
            case M2MInterface::Timeout:
                trace_printer("[ERROR:] M2MInterface::Timeout");
            case M2MInterface::NetworkError:
                trace_printer("[ERROR:] M2MInterface::NetworkError");
            case M2MInterface::ResponseParseFailed:
                trace_printer("[ERROR:] M2MInterface::ResponseParseFailed");
            case M2MInterface::UnknownError:
                trace_printer("[ERROR:] M2MInterface::UnknownError");
            case M2MInterface::MemoryFail:
                trace_printer("[ERROR:] M2MInterface::MemoryFail");
            case M2MInterface::NotAllowed:
                trace_printer("[ERROR:] M2MInterface::NotAllowed");
            case M2MInterface::SecureConnectionFailed:
                trace_printer("[ERROR:] M2MInterface::SecureConnectionFailed");
            case M2MInterface::DnsResolvingFailed:
                trace_printer("[ERROR:] M2MInterface::DnsResolvingFailed");


    /* Callback from mbed client stack if any value has changed
    *  during PUT operation. Object and its type is passed in
    *  the callback.
    *  BaseType enum from m2mbase.h
    *       Object = 0x0, Resource = 0x1, ObjectInstance = 0x2, ResourceInstance = 0x3
    void value_updated(M2MBase *base, M2MBase::BaseType type) {
        printf("\r\nPUT Request Received!");
        printf("\r\nName :'%s', \r\nPath : '%s', \r\nType : '%d' (0 for Object, 1 for Resource), \r\nType : '%s'\r\n",

    * update the registration period
    void test_update_register() {
        if (_registered) {
            _interface->update_registration(_register_security, 100);

    * manually configure the security object private variable
   void set_register_object(M2MSecurity *register_object) {
        if (_register_security == NULL) {
            _register_security = register_object;


    *  Private variables used in class
    M2MInterface    	     *_interface;
    M2MSecurity              *_register_security;
    M2MObject                *_object;
    volatile bool            _bootstrapped;
    volatile bool            _error;
    volatile bool            _registered;
    volatile bool            _unregistered;
    int                      _value;
    struct MbedClientDevice  _device;
    String                   _server_address;

#endif // __SIMPLECLIENT_H__