补充提交udp-simple

simpleVideoRecorder/src/UdpClient.cpp

+#include "UdpClient.hpp"
+#include <Arduino.h>
+#include <errno.h>
+#include <lwip/netdb.h>
+#include <lwip/sockets.h>
+
+LightUDP::LightUDP()
+    : udp_server(-1), server_port(0), remote_port(0), remote_ip_int(0) {}
+
+void LightUDP::begin(IPAddress address, uint16_t port) {
+    server_port = port;
+
+    if ((udp_server = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+        Serial.printf("could not create socket: %d", errno);
+        return;
+    }
+
+    int yes = 1;
+    if (setsockopt(udp_server, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) <
+        0) {
+        Serial.printf("could not set socket option: %d\n", errno);
+
+        return;
+    }
+
+    struct sockaddr_in addr;
+    memset((char*)&addr, 0, sizeof(addr));
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(server_port);
+    addr.sin_addr.s_addr = (in_addr_t)address;
+    if (bind(udp_server, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
+        Serial.printf("could not bind socket: %d\n", errno);
+        return;
+    }
+    fcntl(udp_server, F_SETFL, O_NONBLOCK);
+}
+
+void LightUDP::setServer(const char* host, uint16_t port) {
+    struct hostent* server;
+    server = gethostbyname(host);
+    if (server == NULL) {
+        Serial.printf("could not get host from dns: %d\n", errno);
+        return;
+    }
+    this->remote_ip = IPAddress((const uint8_t*)(server->h_addr_list[0]));
+    this->remote_ip_int = (uint32_t)remote_ip;
+    this->remote_port = port;
+}
+
+void LightUDP::send(uint8_t* buf, size_t len) {
+    if (udp_server == -1) {
+        if ((udp_server = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+            Serial.printf("could not create socket: %d\n", errno);
+            return;
+        }
+        fcntl(udp_server, F_SETFL, O_NONBLOCK);
+    }
+
+    struct sockaddr_in recipient;
+    recipient.sin_addr.s_addr = remote_ip_int;
+    recipient.sin_family = AF_INET;
+    recipient.sin_port = htons(remote_port);
+    int sent = sendto(udp_server, buf, len, 0, (struct sockaddr*)&recipient,
+                      sizeof(recipient));
+    if (sent < 0) {
+        Serial.printf("could not send data: %d\n", errno);
+        return;
+    }
+}
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simpleVideoRecorder/src/UdpClient.hpp

+#include <IPAddress.h>
+#include <lwip/netdb.h>
+#include <lwip/sockets.h>
+
+class LightUDP {
+   private:
+    int udp_server;
+    IPAddress remote_ip;
+    uint32_t remote_ip_int;
+    uint16_t server_port;
+    uint16_t remote_port;
+
+   public:
+    LightUDP();
+    void begin(IPAddress address, uint16_t port);
+    void setServer(const char* host, uint16_t port);
+    void send(uint8_t* buf, size_t len);
+};
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