Antonio Quevedo

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10 years, 4 months ago.

Problems with websocket on FRDM-K64F

Hello,

With the release of a new version of Ethernet and related libraries, I have tried to connect my FRDM-K64F board to the mbed websocket server. I have written a program where I could send messages like "r0", "r1", "g0", "g1", "b0", "b1", so I could turn on and off the RGB LED on the board. This part worked nicely. However, when I tried to implement a "s" message to command the board to send back the status os the 3 LEDs, it failed. Below is my code:

#include "mbed.h"
#include "EthernetInterface.h"
#include "Websocket.h"

DigitalOut ledr(PTB22);
DigitalOut ledg(PTE26);
DigitalOut ledb(PTB21);
DigitalIn sw(PTA4);

int main() {
    int res;
    char buf[100];
    char msg[100];
    ledg = 1;
    ledr = 1;
    ledb = 1;
    bool pb = 1;
    
    printf("START\r\n");
    EthernetInterface eth;
    eth.init();
    eth.connect();
    printf("IP Address is %s\n\r", eth.getIPAddress());
    wait(1.0);
    
    Websocket ws("ws://sockets.mbed.org/ws/quevedo/rw");
    ws.connect();
    
    while (pb) {
        if(!ws.read(buf)) {
            if(buf[0] == 'r') {
                if(buf[1] == '0') {
                    ledr = 0;
                } else {
                    ledr = 1;
                }
            }
            if(buf[0] == 'g') {
                if(buf[1] == '0') {
                    ledg = 0;
                } else {
                    ledg = 1;
                }
            }
            if(buf[0] == 'b') {
                if(buf[1] == '0') {
                    ledb = 0;
                } else {
                    ledb = 1;
                }
            }
            if(buf[0] == 's') {
                msg[0] = ledr + 0x30;
                msg[1] = ',';
                msg[2] = ledg + 0x30;
                msg[3] = ',';
                msg[4] = ledb + 0x30;
                msg[5] = ',';
                msg[6] = 0;
                res = ws.send("Status");
                if(res) printf("Message sent\r\n");
            }
        }
        pb = sw;
    }
    ws.close();
    eth.disconnect();
    ledg = 1;
    ledr = 1;
    ledb = 1;
    while(1) {
    }
}

when I send the "s" message, I can see the "Message sent" answer at the serial terminal, which indicates that the ws.send(Status) command is being issued correctly. Thus, the message is being sent but I cannot see it at the websocket page. Note that I still have not sent status itself, only a single fixed string.

Also, I have tried the original "Websocket_Etnernet_HelloWorld" program:

https://mbed.org/users/samux/code/Websocket_Ethernet_HelloWorld/

This one works correctly, sending one message every second.

What can be going wrong? Anything with the "read/write mode"?

Cheers

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