Environment: Windows Socket Programming using VC++ 2010
GVCP : GigE Vision Control Protocol
GVCP = UDP+(GVCP Header Data+Payload Data). so basically on top its a UDP only
for Detecting GigE Sensor (Camera) need to first Broadcast a GVCP packet (containing Gvcp Payload data), using Broadcast address 255.255.255.255
but i am able to broadcast only by 192.168.1.255 (as seen on wire-shark) when i change broadcast address 255.255.255.255 nothing is visible on wire-shark nor on other machine
so problem is not able to broadcast using IP 255.255.255.255 using UDP/WinSock
able to start broadcasting the GVCP packet its just a socket creation error the correct one is below
//---------------------DATA SENDER------------------------------
struct sockaddr_in Sender_addr;
int Sender_addrlen = sizeof(Sender_addr);
Sender_addr.sin_family = AF_INET;
Sender_addr.sin_port = htons(CAMPORT); //BROADCAST_PORT);
Sender_addr.sin_addr.s_addr = inet_addr("255.255.255.255"); //Broadcast
IP Here");
//---------------------DATA RECEIVER----------------------------
struct sockaddr_in Recv_addr;
int Recv_addrlen = sizeof(Recv_addr);
Recv_addr.sin_family = AF_INET;
Recv_addr.sin_port = htons(PCPORT);
Recv_addr.sin_addr.s_addr = INADDR_ANY;
if(bind(sock,(sockaddr*)&Recv_addr,sizeof(Recv_addr))<0)
{
perror("bind");
_getch;
closesocket(sock);
}
//and then send command for GVCP packet (GVCP packet Structure is )
TxBuff[0] = 0x42;
TxBuff[1] = 0x01;
TxBuff[2] = 0x00;
TxBuff[3] = 0x02;
TxBuff[4] = 0x00;
TxBuff[5] = 0x00;
TxBuff[6] = 0x00;
TxBuff[7] = 0x02;
if(sendto(sock,TxBuff,TxBuffSize,0,(struct sockaddr
*)&Sender_addr,sizeof(Sender_addr)) <0)
{
perror("send: error ");
_getch();
closesocket(sock);
}
Related
I have a client/server LWIP program, I want to use multicast features so I used IGMP library did the following setting like this:
Setting .IOC
Enable LWIP_IGMP
Enable LWIP_MULTICAST_TX_OPTION
Enable LWIP_IP4
in ethernet.c
netif->flags |= NETIF_FLAG_IGMP
in stm32f7xx_hal_eth.c (ETH_MACDMAConfig)
macinit.PromiscuousMode = ETH_PROMISCUOUS_MODE_ENABLE;
macinit.MulticastFramesFilter = ETH_MULTICASTFRAMESFILTER_NONE;
and i implemented code like this :
void UDP_Multicast_init(void *arg)
{
struct ip4_addr ipgroup, localIP;
struct udp_pcb *upcb;
char msg[] = "hello";
struct pbuf* p;
p = pbuf_alloc(PBUF_TRANSPORT,sizeof(msg),PBUF_RAM);
memcpy (p->payload, msg, sizeof(msg));
IP4_ADDR(&ipgroup, 224, 224, 0, 1); //Multicast IP address.
IP4_ADDR(&localIP, 192, 168, 1, 99); //Interface IP address
#if LWIP_IGMP
igmp_joingroup((ip4_addr_t *)(&localIP),(ip4_addr_t *)(&ipgroup));
#endif
upcb = ( struct udp_pcb*) udp_new();
MulticastStart(); //binding connection to the port 10
udp_recv(upcb, UDP_callback, NULL);
udp_sendto(upcb,p,&ipgroup,10);
}
void UDP_callback(void *arg, struct udp_pcb *upcb, struct pbuf *p,
const ip_addr_t *addr, u16_t port)
{
printf("test");
}
and I try to see in wireshark, iplocal successfully joins into the multicast address, and sends a data to the multicast address.
enter image description here
but the callback function cannot be executed.
is there something missing??
thanks for the response.
I'm trying to send data to and from my computer and an STM32H745 over Ethernet using LwIP and UDP. I have successfully configured the card and right now I can send data from the card to a Python script running on the computer. However, I don't understand how udp_recv works <udp,lwip> or how to receive data with UDP on LwIP in general, and I can't find examples that do just that. Where is the data being received? Should I even use udp_recv?
In the main loop I run MX_LWIP_Process, which runs ethernetif_input which somehow handles the received data, but I don't understand where it puts it.
Below is the main code, just for reference.
const char* message = "a";
HAL_GPIO_TogglePin(GPIOE, GPIO_PIN_1); // orange
ip_addr_t PC_IPADDR;
IP_ADDR4(&PC_IPADDR, 192, 168, 1, 200);
u16_t port = 8000;
struct udp_pcb* my_udp = udp_new();
struct pbuf* udp_buffer = NULL;
/* Infinite loop */
for (;; )
{
MX_LWIP_Process();
HAL_GPIO_TogglePin(GPIOE, GPIO_PIN_1); // orange
HAL_Delay(1000);
udp_buffer = pbuf_alloc(PBUF_TRANSPORT, strlen(message), PBUF_RAM);
if (udp_buffer != NULL)
{
memcpy(udp_buffer->payload, message, strlen(message));
udp_sendto(my_udp, udp_buffer,&PC_IPADDR, port);
pbuf_free(udp_buffer);
}
//udp_recv (struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
}
udp_recv() does not actually receive UDP datagrams (despite its name). It registers a callback function that will then be called by MX_LWIP_Process() when a datagram has been buffered. It would better be called udp_set_recv_callback(), but it is what it is.
To that end you should call it once before your executive loop:
udp_bind( my_udp, IP_ADDR_ANY, port ) ;
udp_recv( my_udp, udp_receive_callback, NULL ) ;
/* Infinite loop */
for (;; )
{
// Run the CubeMX LwIP stack
MX_LWIP_Process() ;
...
}
Where udp_receive_callback is a function that will be invoked on receipt of a datagram:
void udp_receive_callback( void* arg, // User argument - udp_recv `arg` parameter
struct udp_pcb* upcb, // Receiving Protocol Control Block
struct pbuf* p, // Pointer to Datagram
const ip_addr_t* addr, // Address of sender
u16_t port ) // Sender port
{
// Process datagram here (non-blocking code)
...
// Must free receive pbuf before return
pbuf_free(p);
}
Examples include:
https://gist.github.com/iwanbk/1399729
https://github.com/STMicroelectronics/STM32CubeF2/blob/master/Projects/STM322xG_EVAL/Applications/LwIP/LwIP_UDP_Echo_Client/Src/udp_echoclient.c
Documentation can be found at https://www.nongnu.org/lwip/2_0_x/group__udp__raw.html
I wish to send a FlexRay data on the bus with the help of CAPL. Whenever I'm sending, I'm getting an error.
(System 14-0002 FlexRay 1: Unable to map PDUs for frame 38(0, 1)A, driver status = 267).
How to send the data on the bus?
I tried to send a message in Canalyzer version 11.0.3, Flexray Slot ID was 38 and Flags were set as 0x10. message channel and channel mask were set as 1. I used froutputDynFrame library function.
Note: I dint use XML file (FlexRay database) for this.
includes
{
}
variables
{
frFrame (38,0,1) dummymsg;
}
on preStart
{
//dummymsg.fr_slotID=38;
dummymsg.fr_channelMask=1;
dummymsg.msgChannel = 1;
dummymsg.fr_flags=0x10;
}
on key 'a'
{
byte i = 0;
dummymsg.byte(i++) = 0x10; // Target Address
dummymsg.byte(i++) = 0x11;
dummymsg.byte(i++) = 0x12; // Source Address
dummymsg.byte(i++) = 0x13;
dummymsg.byte(i++) = 0x10;
dummymsg.byte(i++) = 0x00;
dummymsg.byte(i++) = 0x05;
dummymsg.byte(i++) = 0x10;
dummymsg.byte(i++) = 0x12;
dummymsg.byte(i++) = 0x34;
dummymsg.byte(i++) = 0x56;
dummymsg.FR_PayloadLength = 4;
froutputDynFrame(dummymsg);
}
if the key 'a' is pressed, the data should fall on the bus without errors.
It depends on the schedule. You do need to have Fibex database file or at least proper configuration of your static/dynamic segmentation on the bus.
Only frames in the dynamic segment can be sent using this function frOutputDynFrame
For static segment use frUpdateStatFrame
To check that you are able to send frames/PDUs you can just Insert FlexRay Frame Panel (or PDU Panel) in the simulation setup.
I have a Raspberry Pi working as a WiFi hotspot and an Arduino Uno trying to get data from it using an ESP8266 module.
This is my receiver code for Arduino:
#include <SoftwareSerial.h>
#include <SerialESP8266wifi.h>
#define sw_serial_rx_pin 4 // Connect this pin to TX on the esp8266
#define sw_serial_tx_pin 6 // Connect this pin to RX on the esp8266
#define esp8266_reset_pin 5 // Connect this pin to CH_PD on the esp8266, not reset. (let reset be unconnected)
SoftwareSerial swSerial(sw_serial_rx_pin, sw_serial_tx_pin);
// the last parameter sets the local echo option for the ESP8266 module..
SerialESP8266wifi wifi(swSerial, swSerial, esp8266_reset_pin, Serial);//adding Serial enabled local echo and wifi debug
String inputString;
boolean stringComplete = false;
unsigned long nextPing = 0;
void setup() {
inputString.reserve(20);
swSerial.begin(9600);
Serial.begin(9600);
while (!Serial)
;
Serial.println("Starting wifi");
wifi.setTransportToTCP();// this is also default
// wifi.setTransportToUDP();//Will use UDP when connecting to server, default is TCP
wifi.endSendWithNewline(true); // Will end all transmissions with a newline and carriage return ie println.. default is true
wifi.begin();
wifi.connectToAP("RPi", "raspberry");
wifi.connectToServer("192.168.50.1", "1234");
wifi.send(SERVER, "ESP8266 test app started");
}
void loop() {
//Make sure the esp8266 is started..
if (!wifi.isStarted())
wifi.begin();
//Send what you typed in the arduino console to the server
static char buf[20];
if (stringComplete) {
inputString.toCharArray(buf, sizeof buf);
wifi.send(SERVER, buf);
inputString = "";
stringComplete = false;
}
//Send a ping once in a while..
if (millis() > nextPing) {
wifi.send(SERVER, "Ping ping..");
nextPing = millis() + 10000;
}
//Listen for incoming messages and echo back, will wait until a message is received, or max 6000ms..
WifiMessage in = wifi.listenForIncomingMessage(6000);
if (in.hasData) {
if (in.channel == SERVER)
Serial.println("Message from the server:");
else
Serial.println("Message a local client:");
Serial.println(in.message);
//Echo back;
wifi.send(in.channel, "Echo:", false);
wifi.send(in.channel, in.message);
nextPing = millis() + 10000;
}
//If you want do disconnect from the server use:
// wifi.disconnectFromServer();
}
//Listen for serial input from the console
void serialEvent() {
while (Serial.available()) {
char inChar = (char)Serial.read();
inputString += inChar;
if (inChar == '\n') {
stringComplete = true;
}
}
}
When I execute, the serial monitor shows:
OK ARFa C⸮C⸮j⸮H⸮AT+AWJAP="RPi",#raspberry" WIFI DISCONNECT WIFI
CONNECVED WIFI GOT IP
OK AT+CIFSR
+CIFSR:STAIP,"192.168.50.13"
+CIFQR:STAMAC,"2c:3a:eAT+CIPSTART=4,"TCP","192.0n8.50.1",121l
Link type ERROR
Raspberry Pi's ISC DHCP server:
wlan0: STA 2c:3a:e8:4e:bf:70 RADIUS: starting accounting session
5A3B2C85-000000E9 wlan0: STA 2c:3a:e8:4e:bf:70 WPA: pairwise key
handshake completed (RSN)
I also referred to this SO thread with no luck.
Some assumptions because you have not given the info:
Arduino IDE >=1.85
ESP8266 Community package >=2.41
ESP Module ESP8266-12E with latest AT firmware
if that is the case and these fragments (enclosed by X X) are no typos
+CIFQR:STAMAC,"2c:3a:eXAT+CIPSTART=4,"TCP","192.0XnX8.50.1",121l
this leaves the following points to check
hardware connectors - serial connectors between arduino and esp module
stable power source 3.3V for the ESP module
Sure this is ok - but just in case and as reference for other readers
serial speed - try to increase from 9600 to 57600 or even to 115200 baud
These pieces of code should be in the setup() and not in the loop()
//Make sure the esp8266 is started..
if (!wifi.isStarted())
wifi.begin();
//Send what you typed in the arduino console to the server
static char buf[20];
Code processing
nextPing = millis() + 10000;
at the end of
if (in.hasData) {
might lead to interuptions in the communication
Reason due to the processing of code this might trigger at an unwanted point
Below you can see my code that implements a pretty basic UDP sender in C++ with Winsock. The thing is that no matter how many times I run the code, the socket (the listenSocket) gets bound to a different UDP port. Is there any specific reason for this? Am I doing some mistake in my code?
thanks
#include <cstdlib>
#include <iostream>
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
using namespace std;
int main(int argc, char *argv[])
{
WSADATA wsaData;
SOCKADDR_IN myAddress;
SOCKADDR_IN targetAddress;
int myPort = 60888;
const char *myIP = "192.168.0.1";
int remotePort = 2048;
const char *remoteIP = "192.168.0.2";
SOCKET ListenSocket = INVALID_SOCKET;
SOCKET SendSocket = INVALID_SOCKET;
SOCKET acceptSocket;
char cBuffer[1024] = "Test Buffer";
int nBytesSent = 0;
int nBufSize = strlen(cBuffer);
int iResult;
// Initialize Winsock
if( WSAStartup( MAKEWORD(2, 2), &wsaData ) != NO_ERROR )
{
cerr<<"Socket Initialization: Error with WSAStartup\n";
system("pause");
WSACleanup();
exit(10);
}
ListenSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
SendSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (ListenSocket == INVALID_SOCKET or SendSocket == INVALID_SOCKET)
{
cerr<<"Socket Initialization: Error creating socket"<<endl;
system("pause");
WSACleanup();
exit(11);
}
//bind
myAddress.sin_family = AF_INET;
myAddress.sin_addr.s_addr = inet_addr(myIP);
myAddress.sin_port = htons(myPort);
targetAddress.sin_family = AF_INET;
targetAddress.sin_addr.s_addr = inet_addr(remoteIP);
targetAddress.sin_port = htons(remotePort);
if(bind(ListenSocket, (SOCKADDR*) &myAddress, sizeof(myAddress)) == SOCKET_ERROR)
{
cerr<<"ServerSocket: Failed to connect\n";
system("pause");
WSACleanup();
exit(14);
}
else
printf("Server: bind() is OK.\n");
nBytesSent = sendto(SendSocket, cBuffer, nBufSize, 0,
(SOCKADDR *) &targetAddress,
sizeof(SOCKADDR_IN));
printf("Everything is ok\n");
system("PAUSE");
closesocket(ListenSocket);
closesocket(SendSocket);
return EXIT_SUCCESS;
}
EDIT: Maybe I was not so clear. What I do with this code is to send some data to a remote PC. But what is required is that the UDP segments should appear to be originated from a specific port. How can this be done? Is it wrong what I'm doing here? Now that I'm thinking of it, I guess it is wrong indeed. The SendSocket and ListenSocket don't have any connection, correct? So, how can I make it that the UDP segments appear to originate from a specific UDP port? Thanks!
You are not calling bind() on SendSocket before sending data with it, so WinSock is free to bind that socket to whatever random local IP/Port it needs to. If you have to send data with a specific source IP/Port every time, you have to bind() to that IP/Port first. If that local IP/Port is the same pair you are binding ListenSocket to, then you don't need to use two separate sockets to begin with. You can send data with the same socket that is listening for incoming data.