I've scoured the forum for a simple tcp sockets client example. Not finding anything I started to write one.
#include "mbed.h"
#include "EthernetNetIf.h"
#include "TCPSocket.h"
DigitalOut myled(LED1);
EthernetNetIf ethernet(
IpAddr(192,168,0,155), //IP Address
IpAddr(255,255,255,0), //Network Mask
IpAddr(192,168,0,1), //Gateway
IpAddr(192,168,0,1) //DNS
);
TCPSocket socket;
Host host;
int state;
// JSON message to get a sigle datastream
const char msg[]="{\"method\":\"get\",\"resource\":\"/feeds/1539/datastreams/2\",\"headers\":{\"X-PachubeApiKey\":\""
"key here"
"\"},\"token\" : \"0x123456\"}}";
char domain[] = "beta.pachube.com";
IpAddr ip=IpAddr(173,203,109,233);
int port=8081;
void send_request(const char* msg) {
int len=socket.send(msg,strlen(msg));
// check len==strlen(msg)
printf("message sent\r\n");
}
void read_data() {
char buf[2048];
int len=socket.recv(buf,2048);
buf[len]='\0';
printf("received: %s\r\n",buf);
}
void onSocketEvent(TCPSocketEvent e) {
printf("event:");
switch(e) {
case TCPSOCKET_CONNECTED:
printf("0 connected\r\n");
break;
case TCPSOCKET_ACCEPT:
printf("1 Client is connected, must call accept() to get a new Socket.\r\n");
// can't find an example of this
break;
case TCPSOCKET_READABLE:
printf("2 Socket readable\r\n");
read_data();
break;
case TCPSOCKET_WRITEABLE:
printf("3 Socket writeable\r\n");
send_request(msg);
break;
case TCPSOCKET_CONTIMEOUT:
printf("4 Connection timed out.\r\n");
break;
case TCPSOCKET_CONRST:
printf("5 Connection was reset by remote host.\r\n");
break;
case TCPSOCKET_CONABRT:
printf("6 Connection was aborted.\r\n");
state=0;
break;
case TCPSOCKET_ERROR:
printf("7 Unknown error.\r\n");
break;
case TCPSOCKET_DISCONNECTED:
printf("8 Disconnected.\r\n");
break;
}
}
int main() {
printf("connecting to net ..");
EthernetErr eerr = ethernet.setup();
if (eerr){
printf("error %d\r\n", eerr);
return -1;
}
myled=1;
socket.setOnEvent(onSocketEvent);
host.setPort(port);
host.setIp(ip);
host.setName(domain);
state=1;
printf("connecting to socket ..\r\n");
TCPSocketErr serr = socket.connect(host);
if (serr) {
printf("error [%d]\r\n", (int) serr);
return -1;
}
printf("waiting for event\r\n");
while (state) {
myled=!myled;
Net::poll();
wait(1);
}
socket.close();
myled=0;
while (1) {}
}
It appears to start the ethernet and send the connect request OK.
However, the only event I get back is "connection aborted";
That happens after what seems like a minute of waiting.
Any ideas?
The second question is about the necessary sequence for a client. It looks as if you can send a message as soon as a "connected" event fires.
A call to accept() to get a new socket appears to be needed only for servers - is that right?
Thx. Paul
I've scoured the forum for a simple tcp sockets client example. Not finding anything I started to write one.
#include "mbed.h" #include "EthernetNetIf.h" #include "TCPSocket.h" DigitalOut myled(LED1); EthernetNetIf ethernet( IpAddr(192,168,0,155), //IP Address IpAddr(255,255,255,0), //Network Mask IpAddr(192,168,0,1), //Gateway IpAddr(192,168,0,1) //DNS ); TCPSocket socket; Host host; int state; // JSON message to get a sigle datastream const char msg[]="{\"method\":\"get\",\"resource\":\"/feeds/1539/datastreams/2\",\"headers\":{\"X-PachubeApiKey\":\"" "key here" "\"},\"token\" : \"0x123456\"}}"; char domain[] = "beta.pachube.com"; IpAddr ip=IpAddr(173,203,109,233); int port=8081; void send_request(const char* msg) { int len=socket.send(msg,strlen(msg)); // check len==strlen(msg) printf("message sent\r\n"); } void read_data() { char buf[2048]; int len=socket.recv(buf,2048); buf[len]='\0'; printf("received: %s\r\n",buf); } void onSocketEvent(TCPSocketEvent e) { printf("event:"); switch(e) { case TCPSOCKET_CONNECTED: printf("0 connected\r\n"); break; case TCPSOCKET_ACCEPT: printf("1 Client is connected, must call accept() to get a new Socket.\r\n"); // can't find an example of this break; case TCPSOCKET_READABLE: printf("2 Socket readable\r\n"); read_data(); break; case TCPSOCKET_WRITEABLE: printf("3 Socket writeable\r\n"); send_request(msg); break; case TCPSOCKET_CONTIMEOUT: printf("4 Connection timed out.\r\n"); break; case TCPSOCKET_CONRST: printf("5 Connection was reset by remote host.\r\n"); break; case TCPSOCKET_CONABRT: printf("6 Connection was aborted.\r\n"); state=0; break; case TCPSOCKET_ERROR: printf("7 Unknown error.\r\n"); break; case TCPSOCKET_DISCONNECTED: printf("8 Disconnected.\r\n"); break; } } int main() { printf("connecting to net .."); EthernetErr eerr = ethernet.setup(); if (eerr){ printf("error %d\r\n", eerr); return -1; } myled=1; socket.setOnEvent(onSocketEvent); host.setPort(port); host.setIp(ip); host.setName(domain); state=1; printf("connecting to socket ..\r\n"); TCPSocketErr serr = socket.connect(host); if (serr) { printf("error [%d]\r\n", (int) serr); return -1; } printf("waiting for event\r\n"); while (state) { myled=!myled; Net::poll(); wait(1); } socket.close(); myled=0; while (1) {} }It appears to start the ethernet and send the connect request OK. However, the only event I get back is "connection aborted"; That happens after what seems like a minute of waiting. Any ideas?
The second question is about the necessary sequence for a client. It looks as if you can send a message as soon as a "connected" event fires. A call to accept() to get a new socket appears to be needed only for servers - is that right?
Thx. Paul