basic implementation of client/server for AERPAW, whole lot of mess included

aerpaw/basic_demo/comms.cpp

@@ -0,0 +1,83 @@
+#include <iostream>
+#include <thread>
+#include <vector>
+#include <cstring>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+
+#define SERVER_PORT 5000
+#define SERVER_IP "127.0.0.1"
+
+// Socket init
+void initSockets() {}
+void cleanupSockets() {}
+
+int serverSocket = -1;
+std::vector<int> clientSockets;
+
+extern "C" {
+
+// Initialize server (call once)
+void initServer() {
+    initSockets();
+    serverSocket = socket(AF_INET, SOCK_STREAM, 0);
+    if(serverSocket < 0) { std::cerr << "Socket creation failed\n"; return; }
+
+    sockaddr_in serverAddr;
+    serverAddr.sin_family = AF_INET;
+    serverAddr.sin_addr.s_addr = INADDR_ANY;
+    serverAddr.sin_port = htons(SERVER_PORT);
+
+    int opt = 1;
+    setsockopt(serverSocket, SOL_SOCKET, SO_REUSEADDR, (char*)&opt, sizeof(opt));
+
+    if(bind(serverSocket, (sockaddr*)&serverAddr, sizeof(serverAddr)) < 0) {
+        std::cerr << "Bind failed\n"; return;
+    }
+    if(listen(serverSocket, 5) < 0) {
+        std::cerr << "Listen failed\n"; return;
+    }
+
+    std::cout << "Server initialized, waiting for clients...\n";
+}
+
+// Accept client connections (call once per client)
+void acceptClient(int clientId) {
+    sockaddr_in clientAddr;
+    socklen_t addrLen = sizeof(clientAddr);
+    int clientSock = accept(serverSocket, (sockaddr*)&clientAddr, &addrLen);
+    if(clientSock < 0) { std::cerr << "Accept failed for client " << clientId << "\n"; return; }
+    clientSockets.push_back(clientSock);
+    std::cout << "Client " << clientId << " connected\n";
+}
+
+// Send a message to a specific client
+void sendMessage(int clientId) {
+    if(clientId <= 0 || clientId > clientSockets.size()) return;
+    const char* msg = "Hello from server";
+    send(clientSockets[clientId-1], msg, strlen(msg), 0);
+    std::cout << "Sent message to client " << clientId << "\n";
+}
+
+// Receive ACK from a specific client
+int receiveAck(int clientId) {
+    if(clientId <= 0 || clientId > clientSockets.size()) return 0;
+    char buffer[1024];
+    int len = recv(clientSockets[clientId-1], buffer, sizeof(buffer)-1, 0);
+    if(len <= 0) return 0;
+    buffer[len] = '\0';
+    std::cout << "Received ACK from client " << clientId << ": " << buffer << "\n";
+    return 1;
+}
+
+// Cleanup server
+void closeServer() {
+    for(auto sock : clientSockets) {
+        close(sock);
+    }
+    close(serverSocket);
+    cleanupSockets();
+}
+
+}