hardcoded decklink mode fix

libs/dmf-engine/src/node_control_client.cpp

@@ -85,4 +85,60 @@ bool NodeControlClient::send_command(uint16_t port, const std::string& json_cmd)
     return ok;
 }
 
+std::string NodeControlClient::send_command_with_response(uint16_t port, const std::string& json_cmd) {
+    int fd = socket(AF_INET, SOCK_STREAM, 0);
+    if (fd < 0) {
+        spdlog::error("NodeControlClient: socket() failed: {}", strerror(errno));
+        return "";
+    }
+
+    struct timeval tv;
+    tv.tv_sec = 2;
+    tv.tv_usec = 0;
+    setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
+    setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
+
+    struct sockaddr_in addr;
+    std::memset(&addr, 0, sizeof(addr));
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(port);
+    inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
+
+    if (connect(fd, reinterpret_cast<struct sockaddr*>(&addr), sizeof(addr)) < 0) {
+        spdlog::error("NodeControlClient: connect to port {} failed: {}", port, strerror(errno));
+        close(fd);
+        return "";
+    }
+
+    std::ostringstream req;
+    req << "POST /cmd HTTP/1.1\r\n"
+        << "Host: 127.0.0.1:" << port << "\r\n"
+        << "Content-Type: application/json\r\n"
+        << "Content-Length: " << json_cmd.size() << "\r\n"
+        << "Connection: close\r\n"
+        << "\r\n"
+        << json_cmd;
+
+    auto request = req.str();
+    auto sent = write(fd, request.data(), request.size());
+    if (sent != static_cast<ssize_t>(request.size())) {
+        spdlog::error("NodeControlClient: write failed on port {}", port);
+        close(fd);
+        return "";
+    }
+
+    std::string full_resp;
+    char resp_buf[4096];
+    while (true) {
+        auto n = read(fd, resp_buf, sizeof(resp_buf));
+        if (n <= 0) break;
+        full_resp.append(resp_buf, n);
+    }
+    close(fd);
+
+    auto body_start = full_resp.find("\r\n\r\n");
+    if (body_start == std::string::npos) return "";
+    return full_resp.substr(body_start + 4);
+}
+
 } // namespace dmf_engine