WIZnet / DualNetworkInterface-Basic

..

Dependencies:   ESP8266Interface WIZnetInterface_namespace mbed-src

Dual Network Interface

Some our customers want dual network interface like below. /media/uploads/SteveKim/dual-nic-2.jpg

So, I decided to implement dual network interface with ESP8266(WiFi) and WIZwiki-W7500(Ethernet).

Implementation

But, I had some troubles because of the below.

  • There is no abstract class for all network interface
  • Same header file name in two library WIZnetInterface(EthernetInterface) and ESP8266Interface
  • Same class name in two library WIZnetInterface and ESP8266Interface

If I can modify Makefile, there will be better way to solve this problem. But, I couldn't modify Makefile in mbed.

So I solved this problem using namespace. Of course, there may be another way to change all class name and file name in the library. But, I wanted to minimize the changes of original library.

First, I changed the header file name in WIZnetInterface from <*.h> to <*.hpp>.

Declaration namespace in header file

// Endpoint.hpp
namespace wiznet_space {
   class Endpoint {
       friend class UDPSocket;
       ....................
   }
}

// Socket.hpp
namespace wiznet_space {

  class Socket {
  public:
       Socket();
  ..........................
  }
}
..........................
..........................

Using namespace in source file 

// main.c
..........................

ESP8266Interface wifi(D1, D0, D2, "WizFiDemoAP","12345678",115200); // tx, rx for
wiznet_space::EthernetInterface eth;

bool InitializeWiznetEthernet()
{
    uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0xFF, 0x11, 0x22};
 
    eth.init(mac_addr, "192.168.3.102", "255.255.255.0", "192.168.3.1"); //Use DHCP

    .......................................................................................................................    
}

bool InitializeESP8266()
{   
    wifi.init();

    .......................................................................................................................    
}

int main()
{
    ....................................................................

    // Ethernet : WIZnet hardwired TCP/IP in W7500
    if ( InitializeWiznetEthernet() )
    {
        // Send TCP/IP data via Ethernet
        ProcessDataViaEthernet();
    }    
    
    // WiFi : ESP8266
    if ( InitializeESP8266() )
    {
        // Send TCP/IP data via WiFi
        ProcessDataViaWiFi();
    }

    ....................................................................
}

// ProcessDataViaEthernet.cpp
void ProcessDataViaEthernet()
{
    wiznet_space::TCPSocketConnection eth_sock;
    
    eth_sock.connect("192.168.3.64", 6000);
    char send_data[] = "This is from Ethernet Interface\r\n";
    eth_sock.send_all(send_data, sizeof(send_data)-1);
    eth_sock.close();
}

// ProcessDataViaWiFi.cpp
void ProcessDataViaWiFi()
{
    ::TCPSocketConnection wifi_sock;
    
    wifi_sock.connect("192.168.3.64", 6000);    
    char send_data[] = "This is from WiFi Interface\r\n";
    wifi_sock.send_all(send_data, sizeof(send_data)-1);
    wifi_sock.close();
}

And, here are screenshots of this test. /media/uploads/SteveKim/esd01-2.jpg /media/uploads/SteveKim/esd01-3.jpg

Conclusion

I know that this way is a kind of work-around way. Best way is to design a new network-abstract-class and hierarchical network-interface-classes based on the network-abstract-class.

  • Ethernet : lwIP, WIZnet hardwired TCP/IP
  • WiFi : ESP8266, WiFly, WizFi250, CC3000, ....
  • Other interfaces(3G/4G, BT, .....)

I believe that mbed-team will release a new network classes based on a hierarchical architecture .

Until then, you can refer to the this code for dual network interface, temporarily.

main.cpp

Committer:
SteveKim
Date:
2015-06-29
Revision:
0:0543bf604693
Child:
1:a79f264f321f

File content as of revision 0:0543bf604693:

#include "mbed.h"
#include "EthernetInterface.h"
//#include "ESP8266Interface.h"

#define MAC     "\x00\x08\xDC\xAA\xAA\xAA"
#define IP      "192.168.3.110"
#define MASK    "255.255.255.0"
#define GATEWAY "192.168.3.1"

int main() {
    EthernetInterface eth;

    ////////////////////////////////////////////////////////////////////////////////////    
    // sekim XXXX
    //eth.init(); //Use DHCP
    //uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0xFF, 0x11, 0x22};
    //eth.init(mac_addr);
    eth.init((uint8_t*)MAC,IP,MASK,GATEWAY);  //IP,mask,Gateway
    eth.link();
    ////////////////////////////////////////////////////////////////////////////////////
    
    eth.connect();
    printf("\r\nIP address is %s\r\n", eth.getIPAddress());
    
    TCPSocketConnection sock;
    sock.connect("google.com", 80);
    
    printf("XXX 200 : Connected\r\n");
    
    char http_cmd[] = "GET /hello.txt HTTP/1.0\n\n";
    sock.send_all(http_cmd, sizeof(http_cmd)-1);
    
    char buffer[300];
    int ret;
    while (true) {
        ret = sock.receive(buffer, sizeof(buffer)-1);
        printf("XXX 210 : Recv(%d) \r\n", ret);
        if (ret <= 0)
            break;
        buffer[ret] = '\0';
        printf("Received %d chars from server:\n%s\r\n", ret, buffer);
    }
    
    printf("XXX 220 : Closed\r\n");
      
    sock.close();
    
    eth.disconnect();
    
    while(1) {}
}

/*












#include "mbed.h"
#include "EthernetInterface.h"
 
AnalogIn pot1(A0);
AnalogIn pot2(A1);
 
DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);
 
EthernetInterface eth;
TCPSocketConnection sock;
 
int main() 
{
    //uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0x00, 0x01, 0x02}; 
    uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0xFF, 0x11, 0x22};
    char *MODEL = "mbed";
    char *SERIAL_NUM = "input_your_serial_num"; 
    float DEADBAND = 0.015;   
    char* ip;
    
    int http_cmd_sz=800;
    char http_cmd[http_cmd_sz];
    int buffer_sz=300;  
    char buffer[buffer_sz];  
    int returnCode = 0;
 
     for (int i=0; i<5; i++) {
        led1 = 1;
        wait(0.2);
        led1 = 0;
        wait(0.2);
    }

    led1 = 1;
    led2 = 1;
    led3 = 1;
    led4 = 1;
 
    printf("initializing Ethernet\r\n");
    eth.init(mac_addr); //Use DHCP    
    if ( returnCode == 0 )
    {
        printf(" - Ethernet ready\r\n");
        led1 = returnCode;
    }
    else
    {
        printf(" - Could not initialize Ethernet - ending\r\n");
        return 0;
    }
 
    eth.ethernet_link();
    printf("eth.ethernet_link() %d \r\n", eth.ethernet_link());
    
    printf("Ethernet.connecting \r\n");
    returnCode = eth.connect();
 
    printf(" - connecting returned %d \r\n", returnCode);
    led2 = returnCode != -1 ? 0: 1;
    printf("Trying to get IP address..\r\n");
    ip = eth.getIPAddress();
    led3 = strlen(ip)<4 ? 1: 0;
    printf("  -  IP address:%s\r\n", ip);
    
    float oil_level = 0.0;
    float oil_level2= 0.0;
    float oldPotVal = -2.0;
    float oldPotVal2 = -2.0;
    
    while(1) {
        oil_level = pot1.read();
        oil_level2= pot2.read();
        
        if ( abs(oil_level - oldPotVal) < DEADBAND && abs(oil_level2 - oldPotVal2) < DEADBAND)
        {
            continue;   
        }
        else
        {
            led4 = 1;
            oldPotVal = oil_level;
            oldPotVal2 = oil_level2;
            printf("Sending Value for well1 %.2f\n\r", oil_level);
            printf("Sending Value for well2 %.2f\n\r", oil_level2);
            sock.connect("toolbox-connect.axeda.com", 80);
 
            snprintf(http_cmd, http_cmd_sz,  "POST /ammp/data/1/%s!%s HTTP/1.1\r\nContent-Type: application/json\r\nContent-Length: 65\r\n\r\n{\"data\":[{\"di\":{\"oil_level\":%.2f, \"oil_level2\":%.2f}}]}\r\n\r\n", MODEL, SERIAL_NUM, oil_level, oil_level2);
            sock.send_all(http_cmd, http_cmd_sz-1);
    
            while ( (returnCode = sock.receive(buffer, buffer_sz-1)) > 0)
            {
                buffer[returnCode] = '\0';
                printf("Received %d chars from server:\n\r%s\n", returnCode, buffer);
            }
            led4 = returnCode;
            sock.close();
        }
 
    }
 
}
 */