This is a mbed Client sample where ZXing is incorporated, and works on GR-PEACH and GR-LYCHEE.

Dependencies:   DisplayApp AsciiFont

Overview

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:
    https://os.mbed.com/teams/Renesas/code/GR-PEACH_mbed-os-client-ZXingSample/wiki/Connection-type.
  2. Set the client credentials. For details, please refer to the following wiki:
    https://os.mbed.com/teams/Renesas/code/GR-PEACH_mbed-os-client-ZXingSample/wiki/Client-credentials.
  3. Change Ethernet settings. For details, please refer to the following wiki:
    https://developer.mbed.org/teams/Renesas/code/GR-PEACH_mbed-os-client-ZXingSample/wiki/Ethernet-settings.
  4. Change Wifi settings. For details, please refer to the following wiki:
    https://os.mbed.com/teams/Renesas/code/GR-PEACH_mbed-os-client-ZXingSample/wiki/Wifi-settings.
  5. Set up an IP address. (This step is optional.) For details, please refer to the following wiki:
    https://os.mbed.com/teams/Renesas/code/GR-PEACH_mbed-os-client-ZXingSample/wiki/IP-address-setup.

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 Ethernet cable into GR-PEACH or GR-LYCHEE if you are using Ethernet mode.
  5. Plug the micro-USB cable into the OpenSDA port which lies on the next to the RESET button.
  6. Copy the binary previously downloaded to your PC to GR-PEACH or GR-LYCHEE to flash this example. When the copy is successfully completed, the board is ready to work.
  7. Press the RESET button on the board to run the example.
  8. For verification, please refer to the following wiki:
    https://developer.mbed.org/teams/Renesas/code/GR-PEACH_mbed-os-client-ZXingSample/wiki/Monitoring-the-application.

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 red, green, blue, cyan, yellow and magenta is acceptable if you are using GR-PEACH board (PUT).
  5. 3201/0/5855. Blink color, used by the blink function. Any of green, yellow, orange and red is acceptable if you are using GR-LYCHEE board (PUT).

For more info on how to get notifications when resource 1 changes, or how to use resource 2, 3 and 4, please look at

Import programGR-PEACH_mbed-connector-ZXingSample-node

Node.js based Web Application for mbed Device Connector specific to GR-PEACH_mbed-os-client-ZXingSample

main.cpp

Committer:
dkato
Date:
2017-03-28
Revision:
2:6ec5c1c1d41c
Parent:
0:eb73febb2bba
Child:
6:ea24d9271ff1

File content as of revision 2:6ec5c1c1d41c:

/*
 * Copyright (c) 2015, 2016 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.
 */
#include "mbed-trace/mbed_trace.h"
#include "mbed.h"
#include "zxing_main.h"

// Network interaction must be performed outside of interrupt context
osThreadId mainThread;

#define NO_CONNECT         (-1)

#if MBED_CONF_APP_NETWORK_INTERFACE == NO_CONNECT

static void callback_zxing(char * addr, int size) {
    printf("%s\r\n", addr);
}

// Entry point to the program
int main() {
    // Keep track of the main thread
    mainThread = osThreadGetId();
    printf("no connect\n");
    mbed_trace_init();
    zxing_init(&callback_zxing);

    while (1) {
        zxing_loop();
        Thread::wait(5);
    }
}

#else // MBED_CONF_APP_NETWORK_INTERFACE != NO_CONNECT

#define __STDC_FORMAT_MACROS
#include <string>
#include <sstream>
#include <vector>
#include "security.h"
#include "simpleclient.h"
#include "mbedtls/entropy_poll.h"

// easy-connect compliancy, it has 2 sets of wifi pins we have only one
#define MBED_CONF_APP_ESP8266_TX MBED_CONF_APP_WIFI_TX
#define MBED_CONF_APP_ESP8266_RX MBED_CONF_APP_WIFI_RX
#include "easy-connect.h"

// These are example resource values for the Device Object
struct MbedClientDevice device = {
    "Manufacturer_String",      // Manufacturer
    "Type_String",              // Type
    "ModelNumber_String",       // ModelNumber
    "SerialNumber_String"       // SerialNumber
};

// Instantiate the class which implements LWM2M Client API (from simpleclient.h)
MbedClient mbed_client(device);

// LED Output
DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
/*
 * The Led contains one property (pattern) and a function (blink).
 * When the function blink is executed, the pattern is read, and the LED
 * will blink based on the pattern.
 */
class LedResource {
public:
    LedResource() {
        // create ObjectID with metadata tag of '3201', which is 'digital output'
        led_object = M2MInterfaceFactory::create_object("3201");
        M2MObjectInstance* led_inst = led_object->create_object_instance();

        // 5855 = Multi-state output
        M2MResource* color_res = led_inst->create_dynamic_resource("5855", "Color",
            M2MResourceInstance::STRING, false);
        // read and write
        color_res->set_operation(M2MBase::GET_PUT_ALLOWED);
        // set red as initial color
        color_res->set_value((const uint8_t*)"red", 3);
        
        // 5853 = Multi-state output
        M2MResource* pattern_res = led_inst->create_dynamic_resource("5853", "Pattern",
            M2MResourceInstance::STRING, false);
        // read and write
        pattern_res->set_operation(M2MBase::GET_PUT_ALLOWED);
        // set initial pattern (toggle every 200ms. 7 toggles in total)
        pattern_res->set_value((const uint8_t*)"500:500:500:500:500:500:500", 27);

        // there's not really an execute LWM2M ID that matches... hmm...
        M2MResource* led_res = led_inst->create_dynamic_resource("5850", "Blink",
            M2MResourceInstance::OPAQUE, false);
        // we allow executing a function here...
        led_res->set_operation(M2MBase::POST_ALLOWED);
        // when a POST comes in, we want to execute the led_execute_callback
        led_res->set_execute_function(execute_callback(this, &LedResource::blink));

    }

    M2MObject* get_object() {
        return led_object;
    }

    void blink(void *argument) {


        // read the value of 'Pattern'
        M2MObjectInstance* inst = led_object->object_instance();
        M2MResource* res = inst->resource("5853");
        // read the value of 'Color'
        M2MObjectInstance* instC = led_object->object_instance();
        M2MResource* resC = instC->resource("5855");

        // values in mbed Client are all buffers, and we need a vector of int's
        uint8_t* buffIn = NULL;
        uint32_t sizeIn;
        res->get_value(buffIn, sizeIn);
        
        uint8_t* cbuffIn = NULL;
        uint32_t csizeIn;
        resC->get_value(cbuffIn, csizeIn);

        // turn the buffer into a string, and initialize a vector<int> on the heap
        std::string s((char*)buffIn, sizeIn);
        std::vector<uint32_t>* v = new std::vector<uint32_t>;

        printf("led_execute_callback pattern=%s\r\n", s.c_str());

        // our pattern is something like 500:200:500, so parse that
        std::size_t found = s.find_first_of(":");
        while (found!=std::string::npos) {

            v->push_back(atoi((const char*)s.substr(0,found).c_str()));
            s = s.substr(found+1);
            found=s.find_first_of(":");
            if(found == std::string::npos) {
                v->push_back(atoi((const char*)s.c_str()));
            }
        }
        int position = 0;
        while (1) {
            do_blink(cbuffIn);
            if (position >= v->size()) {
                break;
            }
            // how long do we need to wait before the next blink?
            Thread::wait(v->at(position));
            position++;
        }
        free(buffIn);
        free(cbuffIn);
        delete v;
    }

private:
    M2MObject* led_object;
    void do_blink(uint8_t* color) {
        
        if (!strcmp((char *)color, "red")) {
            // blink the LED in red color
            led1 = !led1;
        }
        else if (!strcmp((char *)color, "green")) {
            // blink in green color
            led2 = !led2;
        }
        else if (!strcmp((char *)color, "blue")) {
            // blink in blue color
            led3 = !led3;
        }
        else if (!strcmp((char *)color, "cyan")) {
            // blink in cyan color
            led2 = !led2;
            led3 = !led3;
        }
        else if (!strcmp((char *)color, "yellow")) {
            // blink in yellow color
            led1 = !led1;
            led2 = !led2;
        }
        else if (!strcmp((char *)color, "magenta")) {
            // blink in magenta color
            led1 = !led1;
            led3 = !led3;
        }            
        else if (!strcmp((char *)color, "white")) {
            // blink in white color
            led1 = !led1;
            led2 = !led2;
            led3 = !led3;
        }
        else {
            // no operation
        }
    }
};

/*
 * The Zxing contains a function (send string).
 * When `handle_string_send` is executed, the string after decoding is sent.
 */
class ZxingResource {
public:
    ZxingResource() {
        // create ObjectID with metadata tag of '3202', which is 'send string'
        zxing_object = M2MInterfaceFactory::create_object("3202");
        M2MObjectInstance* zxing_inst = zxing_object->create_object_instance();
        // create resource with ID '5700', which is 'send string'
        M2MResource* zxing_res = zxing_inst->create_dynamic_resource("5700", "zxing",
            M2MResourceInstance::STRING, true);
        // we can read this value
        zxing_res->set_operation(M2MBase::GET_ALLOWED);
        // set initial value (all values in mbed Client are buffers)
        // to be able to read this data easily in the Connector console, we'll use a string
        zxing_res->set_value((uint8_t*)"0", 1);
    }

    ~ZxingResource() {
    }

    M2MObject* get_object() {
        return zxing_object;
    }

    /*
     * When you success the decode process of barcode, we send the string after decoding to mbed Device Connector.
     */
    void handle_string_send(char * addr, int size) {
        M2MObjectInstance* inst = zxing_object->object_instance();
        M2MResource* res = inst->resource("5700");

        printf("%s\r\n", addr);

        // tell the string to connector
        res->set_value((uint8_t *)addr, size);
    }

private:
    M2MObject* zxing_object;
};

ZxingResource zxing_resource;

static void callback_zxing(char * addr, int size) {
    zxing_resource.handle_string_send(addr, size);
}

static volatile bool registered;

void unregister() {
    registered = false;
}

// Entry point to the program
int main() {

    unsigned int seed;
    size_t len;

#ifdef MBEDTLS_ENTROPY_HARDWARE_ALT
    // Used to randomize source port
    mbedtls_hardware_poll(NULL, (unsigned char *) &seed, sizeof seed, &len);

#elif defined MBEDTLS_TEST_NULL_ENTROPY

#warning "mbedTLS security feature is disabled. Connection will not be secure !! Implement proper hardware entropy for your selected hardware."
    // Used to randomize source port
    mbedtls_null_entropy_poll( NULL,(unsigned char *) &seed, sizeof seed, &len);

#else

#error "This hardware does not have entropy, endpoint will not register to Connector.\
You need to enable NULL ENTROPY for your application, but if this configuration change is made then no security is offered by mbed TLS.\
Add MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES and MBEDTLS_TEST_NULL_ENTROPY in mbed_app.json macros to register your endpoint."

#endif

    srand(seed);
    // Keep track of the main thread
    mainThread = osThreadGetId();
    printf("\nStarting mbed Client example in ");

#if defined (MESH) || (MBED_CONF_LWIP_IPV6_ENABLED==true)
    printf("IPv6 mode\n");
#else
    printf("IPv4 mode\n");
#endif

    mbed_trace_init();

#if MBED_CONF_APP_NETWORK_INTERFACE == WIFI_BP3595
    DigitalOut usb1en(P3_8);
    usb1en = 1;
    Thread::wait(5);
    usb1en = 0;
    Thread::wait(5);
#endif

    NetworkInterface* network = easy_connect(true);
    if(network == NULL) {
        printf("\nConnection to Network Failed - exiting application...\n");
        return -1;
    }
    LedResource led_resource;

    // Create endpoint interface to manage register and unregister
    mbed_client.create_interface(MBED_SERVER_ADDRESS, network);

    // Create Objects of varying types, see simpleclient.h for more details on implementation.
    M2MSecurity* register_object = mbed_client.create_register_object(); // server object specifying connector info
    M2MDevice*   device_object   = mbed_client.create_device_object();   // device resources object

    // Create list of Objects to register
    M2MObjectList object_list;

    // Add objects to list
    object_list.push_back(device_object);
    object_list.push_back(led_resource.get_object());
    object_list.push_back(zxing_resource.get_object());

    // Set endpoint registration object
    mbed_client.set_register_object(register_object);

    // Register with mbed Device Connector
    mbed_client.test_register(register_object, object_list);

    zxing_init(&callback_zxing);

    Timer update_timer;
    update_timer.reset();
    update_timer.start();

    registered = true;
    InterruptIn unreg_button(USER_BUTTON0);
    unreg_button.fall(&unregister);

    while (registered) {
        if (zxing_loop() == 0) {
            update_timer.reset();
        } else if (update_timer.read() >= 25) {
            mbed_client.test_update_register();
            update_timer.reset();
        } else {
            // do nothing
        }
        Thread::wait(5);
    }

    mbed_client.test_unregister();
}

#endif // MBED_CONF_APP_NETWORK_INTERFACE != NO_CONNECT