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

AnalogIn ain(p20);

int main()
{

char json_str[100];
int fecg;

EthernetInterface eth;
eth.init();
eth.connect();
printf("IP Address is %s\n\r", eth.getIPAddress());

Websocket ws("ws://sockets.mbed.org:443/ws/ecg/wo");
ws.connect();

while (1)
    {   
    fecg = ain/50;
    sprintf (json_str, "{\"id\":\"ECG\",\"ecg\":%d\"}", (int)fecg);
    ws.send(json_str);
    }  
}    

Hi, I have recently been experimenting with the mbed websocket and managed to send some text to the server. Next I would like to display a real time graph of a analog input. The code below is my attempt to this. <<code title=include the mbed library with this snippet>> #include "mbed.h" #include "EthernetInterface.h" #include "Websocket.h" AnalogIn ain(p20); int main() { char json_str[100]; int fecg; EthernetInterface eth; eth.init(); eth.connect(); printf("IP Address is %s\n\r", eth.getIPAddress()); Websocket ws("ws://sockets.mbed.org:443/ws/ecg/wo"); ws.connect(); while (1) { fecg = ain/50; sprintf (json_str, "{\"id\":\"ECG\",\"ecg\":%d\"}", (int)fecg); ws.send(json_str); } } <</code>> As I understand it, I should be able to send data to the server, http://sockets.mbed.org/ecg, in json and it would display a graph automatically with me having to code anything for the server. Is this correct and so did I make a mistake in the code above or am I completely wrong and have to program the server using eclipse since I am on windows? Thanks

Did you ever figure the graph out? I'm wanting to do the same thing but lack practical graphics and html / web programming

not yet, will post update when i do

Have you looked at Jchart2D? I want to do something similar as well. I have the real time plot looking nice, but I haven't started the JSON part yet.