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8 years, 4 months ago.
UDP server no respons
Made the UDP server using the "UIPEthernet" library and enc28j60. The code is compiled, the server pings, but when I send a request from the Python client, the answer does not come. It seems that "parsePacket ()" does not work. What's my mistake?
main.cpp
#include "mbed.h"
#include "UIPEthernet.h"
UIPEthernetClass Ethernet(D11, D12, D13, D10); //mosi, miso, sck, cs
int main(void) {
EthernetUDP udp;
const uint8_t MY_MAC[6] = { 1, 2, 3, 4,5, 6 };
const uint16_t MY_PORT = 10001;
const IPAddress MY_IP(192, 168,1, 33);
Ethernet.begin(MY_MAC, MY_IP); int success = udp.begin(MY_PORT);
while(1) {
int size= udp.parsePacket();
while ((size= udp.available())>0) {
char* msg = (char*)malloc( size+1);
int len = udp.read(msg, size+1);
msg[len]=0;
free(msg);
}
udp.flush();
int success;
while (!success) {
success = udp.beginPacket(udp.remoteIP(),udp.remotePort());
}
char* acknowledge = "Data";
success = udp.write((uint8_t*)acknowledge, strlen(acknowledge));
success = udp.endPacket();
udp.stop();
}
}
1 Answer
8 years, 4 months ago.
Hello Aleksey,
I ran the UDP server code below on a NUCLEO-F103RB + ENC28J60:
#include "mbed.h"
#include "UIPEthernet.h"
#include "UIPUdp.h"
Serial pc(USBTX, USBRX);
UIPEthernetClass UIPEthernet(D11, D12, D13, D10); // mosi, miso, sck, cs
// MAC number must be unique within the connected network. Modify as appropriate.
const uint8_t MY_MAC[6] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 };
const uint16_t MY_PORT = 7;
UIPUDP udp;
/**
* @brief
* @note
* @param
* @retval
*/
int main(void) {
// IP address must be unique and compatible with your network.
const IPAddress MY_IP(192, 168, 1, 181);
UIPEthernet.begin(MY_MAC, MY_IP);
IPAddress localIP = UIPEthernet.localIP();
pc.printf("Local IP = ");
for(uint8_t i = 0; i < 3; i++)
pc.printf("%d.", localIP[i]);
pc.printf("%d\r\n", localIP[3]);
pc.printf("Initialization ");
if(udp.begin(MY_PORT))
pc.printf("succeeded.\r\n");
else
pc.printf("failed.\r\n");
while(1) {
int size = udp.parsePacket();
if(size > 0) {
do {
char* msg = (char*)malloc(size + 1);
int len = udp.read(msg, size + 1);
msg[len] = 0;
} while((size = udp.available()) > 0);
//finish reading this packet:
udp.flush();
int success;
do {
//send new packet back to ip/port of client. This also
//configures the current connection to ignore packets from
//other clients!
success = udp.beginPacket(udp.remoteIP(), udp.remotePort());
if(success)
pc.printf("beginPacket: succeeded%\r\n");
else
pc.printf("beginPacket: failed%\r\n");
//beginPacket fails if remote ethaddr is unknown. In this case an
//arp-request is send out first and beginPacket succeeds as soon
//the arp-response is received.
} while(!success);
char* message = "Hello World from mbed";
success = udp.write((uint8_t*)message, strlen(message));
if(success)
pc.printf("bytes written: %d\r\n", success);
success = udp.endPacket();
if(success)
pc.printf("endPacket: succeeded%\r\n");
else
pc.printf("endPacket: failed%\r\n");
udp.stop();
//restart with new connection to receive packets from other clients
if(udp.begin(MY_PORT))
pc.printf("restart connection: succeeded%\r\n");
else
pc.printf("restart connection: failed%\r\n");
}
}
}
Then I used the following UDP client, running on a LPC1768, to send it UDP messages:
/*------------------------------------------------------------------------------------*/
/* Ethernet UDP Client (to be used with Ethernet_UDP_server) */
/*------------------------------------------------------------------------------------*/
/*--COMPANY-----AUTHOR------DATE------------REVISION----NOTES-------------------------*/
/* NXP mareikeFSL 2015.12.23 rev 1.0 initial */
/* */
/*------------------------------------------------------------------------------------*/
/* This "Hello World" program is used in conjunction with the Ethernet_UDP_server */
/* program. It communicates between two FRDM-K64F boards via the Ethernet protocol. */
/* To use this program, you need to do the following: */
/* - Connect an Ethernet cable between two FRDM-K64F boards (a crossover cable */
/* is not required). */
/* - Flash one board with Ethernet_UDP_client and the other with */
/* Ethernet_UDP_server */
/* - [optional] If you would like to see the "Hello World" output on your */
/* monitor, install and open a terminal. Tera Term is used in the Wiki for */
/* this program. */
/*------------------------------------------------------------------------------------*/
/*--INCLUDES----------------------------------------------------------------------------*/
#include "mbed.h"
#include "EthernetInterface.h"
/*--DEFINES-----------------------------------------------------------------------------*/
/*--CONSTANTS---------------------------------------------------------------------------*/
const int PORT = 7;
static const char* SERVER_IP = "192.168.1.181"; //IP of server board
static const char* CLIENT_IP = "192.168.1.182"; //IP of client board
static const char* MASK = "255.255.255.0"; //mask
static const char* GATEWAY = "192.168.1.1"; //gateway
/*--INITS-------------------------------------------------------------------------------*/
Serial pc(USBTX, USBRX); //create PC interface
EthernetInterface eth; //create ethernet
UDPSocket sock; //creat Ethernet socket
Endpoint server; //create endpoint
DigitalOut red(LED1); //debug led
DigitalOut green(LED2); //debug led
/*--VARIABLES---------------------------------------------------------------------------*/
int n; //size of received message
char in_buffer[1]; //create receive buffer
char counter[1] = {0}; //sample send buffer
/*--FUNCTION DECLARATIONS---------------------------------------------------------------*/
void init_usb(void); //initializes pc.printf if required
void init_eth(void); //initializes Ethernet
void end_eth(void); //closes Ethernet socket
int main(void); //main
/*--FUNCTION DEFINITIONS----------------------------------------------------------------*/
/*****************************************************************************INIT_USB***/
void init_usb(void)
{
pc.baud(9600); //baud
} //end init_usb()
/*****************************************************************************INIT_ETH***/
void init_eth(void)
{
eth.init(CLIENT_IP, MASK, GATEWAY); //set up IP
eth.connect(); //connect ethernet
pc.printf("\nCLIENT - Client IP Address is %s\r\n", eth.getIPAddress()); //get client IP address
sock.init(); //initialize socket
server.set_address(SERVER_IP, PORT); //set address of server
} //end init_eth()
/******************************************************************************END_ETH***/
void end_eth(void)
{
sock.close(); //close socket
eth.disconnect(); //close Ethernet
} //end end_eth()
/*********************************************************************************MAIN***/
int main(void)
{
red = 0; //client
green = 1;
init_usb(); //initialize the PC interface
init_eth(); //initialize the Ethernet connection
while(true) //repeat forever
{
pc.printf("\nCLIENT - Sending '%i' to server %s\r\n", counter[0], SERVER_IP); //print message to send
sock.sendTo(server, counter, sizeof(counter)); //send message
pc.printf("CLIENT - Waiting for UDP packet...\r\n"); //wait for message
n = sock.receiveFrom(server, in_buffer, sizeof(in_buffer)); //receive message from server
in_buffer[n] = '\0'; //add \0 to end of message
pc.printf("CLIENT - Received '%i' from server %s\r\n", in_buffer[0], SERVER_IP); //print message received
counter[0] = (counter[0] + 1)%11; //only count up to 10, then reset to 0
wait(1); //wait 1 second
}
} //end main()
and everything worked fine. So it seems that there is some issue with the Python application you used.
Accepted Answer