通过esp8266通过UDP广播消息 、、、 当我以esp8266为接入点将UDP数据包作为广播消息发送到所有esp8266时,其他人不会接收到,但是当我使用家庭路由器甚至移动热点作为接入点时,广播消息会被另一个esp8266接收。此外,我还在这里发布了用于UDP的代码的一部分,因此您可能会看到一些变量是未声明的,但它们最初是...
在接收UDP数据时,可以使用recvfrom函数,并将接收到的数据填充到上述结构体中。以下是一个示例代码: c #include <string.h> #include <lwip/sockets.h> #include <lwip/netdb.h> #include "udp_packet_struct.h" void receive_udp_data(int sockfd) { struct udp_packet packet; cha...
Re: ESP32 receive broadcast UDP packets by the_snoofy » Fri Sep 16, 2022 7:42 am Hello, thanks for your answers. I wrote this: Code: Select all static void UDP_task(void *pvParameters) { char rx_buffer[4096]; int addr_family = 0; int ip_protocol = 0; while (1) { struct...
I am trying to do a similar process using ESP Mesh Lite defining the UDP client-server with the same port. Client Node: Sends UDP packet to IP address 192.168.4.2 (Parent Node IP) - Message is sent successfully. Server Node (Allocated 192.168.4.2 by ESP Mesh Lite): Cannot receive the ...
;//将数据receive data:放入发送的缓冲区Udp.println(incomingPacket);//将接收到的数据放入发送的缓冲区Udp.endPacket();//向目标IP目标端口发送数据}} 程序烧录验证 将以上程序烧录进ESP32之后,我们在网上找一个可以进行UDP通信的软件进行通信测试,成功之后以上程序可以作为以后写UDP通信程序的模板进行使用...
ESP32 Multicast UDP High losses (receiving) Mon Jul 02, 2018 9:32 am Hello, I'm developing device that have a UDP socket open only to receive broadcast packets on one port (7890 to be exact). The problem is that the data losses are high - around 90%. My test setup is: ESP32...
MEMP_NUM_UDP_PCB(Number of UDP Connections):UDP协议控制块数量,决定 UDP 协议控制块需要的 POOL 资源。 LWIP_TCP(TCP Module)传输控制协议:选择Enabled。 MEMP_NUM_TCP_PCB(Number of TDP Connections):同时活动的TCP连接数。 在Key Options进行关键选项配置。
UDP接收数据 * */ private void UDPReceive(){ //开启线程接收数据 new Thread(new Runnable() { @Override public void run() { byte[] Receive_buffer = new byte[1024];//创建接收缓存区 try { UDPReceiveSocket = new DatagramSocket(UDPSeverPort); while(true){ DatagramPacket receivePacket = new ...
ESP_LOGE(TAG,"UDP Receive had error!Reset socket.."); recSocket = 0; } else{ ESP_LOGE(TAG,"Rec timeout"); } }else{ vTaskDelay(2000); recSocket = CreateUDPClient(NET_CFG_LISTEN_PORT); ESP_LOGI(TAG,"Create Config listen socket!,socket:%d",recSocket); ...
socket.send(packet); socket.setBroadcast(true); socket.close(); }catch(Exception e) { e.printStackTrace(); } } }).start(); } 这样就可以在该局域网内部广播UDP数据,当ESP32CAM收到特定的数据之后则会返回设备名称,ESPCAM端UDP的回复部分代码如下 ...