diff --git a/apps/android/native/rtc_bridge.cpp b/apps/android/native/rtc_bridge.cpp
index a0ebbc79..df4a0506 100644
--- a/apps/android/native/rtc_bridge.cpp
+++ b/apps/android/native/rtc_bridge.cpp
@@ -2,7 +2,6 @@
 #include <android/native_window_jni.h>
 #include <libyuv.h>
 #include <minirtc.h>
-#include <log.h>
 #include <remote_action.h>
 #include <app_version.h>
 #include <stream_names.h>
@@ -19,7 +18,6 @@
 #include <vector>
 #include "controller_protocol.h"
 #include "file_transfer_session.h"
-#include "android_codec_support.h"
 #include "latest_frame_worker.h"
 #include "video_picture.h"
 #include "video_timing.h"
@@ -289,7 +287,7 @@ Session* From(jlong handle) { return reinterpret_cast<Session*>(handle); }
 
 extern "C" JNIEXPORT jint JNI_OnLoad(JavaVM* java_vm, void*) {
   vm = java_vm;
-  minirtc::android::SetJavaVm(java_vm);
+  if (SetMiniRtcAndroidJavaVm(java_vm) != 0) return JNI_ERR;
   return JNI_VERSION_1_6;
 }
 #define JNI_METHOD(name) Java_cn_crossdesk_mobile_NativeSession_##name
@@ -343,8 +341,8 @@ extern "C" JNIEXPORT jlong JNICALL JNI_METHOD(nCreate)(
       throw std::runtime_error("Unable to configure Android trust bundle");
     // MiniRTC's diagnostic log includes login identities. Keep credentials
     // solely in Keystore-backed storage; do not persist its session logging.
-    minirtc::InitLogger(s->log_path);
-    minirtc::get_logger()->set_level(spdlog::level::off);
+    if (ConfigureMiniRtcLogging(MiniRtcLogOff, nullptr, nullptr) != 0)
+      throw std::runtime_error("Unable to configure MiniRTC logging");
     auto params = Parameters(s.get(), false);
     s->identity = CreatePeer(&params);
     if (!s->identity || Init(s->identity) != 0) return 0;
diff --git a/apps/android/native/xmake.lua b/apps/android/native/xmake.lua
index 82366181..b245d572 100644
--- a/apps/android/native/xmake.lua
+++ b/apps/android/native/xmake.lua
@@ -9,11 +9,9 @@ includes("../../../deps/submodules/minirtc")
 target("crossdesk_android")
     set_kind("shared")
     add_deps("minirtc")
-    add_packages("nlohmann_json", "libyuv", "spdlog")
+    add_packages("nlohmann_json", "libyuv")
     add_files("rtc_bridge.cpp", "../../../libs/wire/src/remote_action.cpp", "../../../libs/wire/src/app_version.cpp", "../../../libs/wire/src/file_transfer.cpp")
     add_includedirs("../../../deps/submodules/minirtc/src/api", "../../../libs/wire/include")
-    -- This source-level JNI adapter is the only application layer using MiniRTC internals.
-    add_includedirs("../../../deps/submodules/minirtc/src/media/mediacodec")
     add_syslinks("android", "log")
     add_shflags("-Wl,-z,max-page-size=16384", "-Wl,-z,common-page-size=16384", {force = true})
     set_targetdir("../app/build/native/arm64-v8a")
diff --git a/apps/cli/xmake.lua b/apps/cli/xmake.lua
index b4f02b2a..a135f0d7 100644
--- a/apps/cli/xmake.lua
+++ b/apps/cli/xmake.lua
@@ -16,7 +16,6 @@ target("crossdesk_controller")
     add_packages("spdlog", "libpng", "libyuv")
     add_includedirs(path.join(controller_dir, "include"),
         path.join(minirtc_dir, "src/api"), {public = true})
-    add_includedirs(path.join(minirtc_dir, "src/log"))
     add_files(path.join(controller_dir, "src/*.cpp"))
     remove_files(path.join(controller_dir, "src/file_browser.cpp"))
 target_end()
diff --git a/apps/desktop/src/config_center/config_center.cpp b/apps/desktop/src/config_center/config_center.cpp
index 587ae5f7..4cee7957 100644
--- a/apps/desktop/src/config_center/config_center.cpp
+++ b/apps/desktop/src/config_center/config_center.cpp
@@ -10,7 +10,7 @@
 #include "SimpleIni.h"
 #include "autostart.h"
 #include "rd_log.h"
-#include "signal_server_address.h"
+#include <minirtc.h>
 
 namespace crossdesk {
 
@@ -349,22 +349,24 @@ int ConfigCenter::SetForceRelay(bool force_relay) {
 }
 
 int ConfigCenter::SetServerHost(const std::string& host) {
-  const auto address = minirtc::ParseSignalServerAddress(host);
-  if (!address) return -1;
-  if (address->port) return SetServerEndpoint(host, *address->port);
-  if (StoreValues({{"signal_server_host", address->Address()}}) != 0) return -1;
-  signal_server_host_ = address->Address();
+  MiniRtcSignalServerAddress address{};
+  if (ParseMiniRtcSignalServerAddress(host.data(), host.size(), &address) != 0) return -1;
+  if (address.port) return SetServerEndpoint(host, address.port);
+  const auto normalized = std::string(address.host) + address.target;
+  if (StoreValues({{"signal_server_host", normalized}}) != 0) return -1;
+  signal_server_host_ = normalized;
   return 0;
 }
 
 int ConfigCenter::SetServerEndpoint(const std::string& host, int port) {
-  const auto address = minirtc::ParseSignalServerAddress(host);
-  if (!address) return -1;
-  port = address->port.value_or(port);
+  MiniRtcSignalServerAddress address{};
+  if (ParseMiniRtcSignalServerAddress(host.data(), host.size(), &address) != 0) return -1;
+  if (address.port) port = address.port;
   if (port < 1 || port > 65535) return -1;
-  if (StoreValues({{"signal_server_host", address->Address()},
+  const auto normalized = std::string(address.host) + address.target;
+  if (StoreValues({{"signal_server_host", normalized},
                    {"signal_server_port", std::to_string(port)}}) != 0) return -1;
-  signal_server_host_ = address->Address();
+  signal_server_host_ = normalized;
   signal_server_port_ = port;
   return 0;
 }
diff --git a/apps/desktop/src/gui/application/gui_application.cpp b/apps/desktop/src/gui/application/gui_application.cpp
index 9056b5e0..4c99bada 100644
--- a/apps/desktop/src/gui/application/gui_application.cpp
+++ b/apps/desktop/src/gui/application/gui_application.cpp
@@ -87,7 +87,7 @@
 #include "rd_log.h"
 #include "server_window_state.h"
 #include "signal_server_settings.h"
-#include "signal_server_address.h"
+#include <minirtc.h>
 #include "ui/announcement_text.h"
 #include "ui/model_update.h"
 #include "ui/release_notes_text.h"
@@ -3532,11 +3532,11 @@ void GuiApplication::SyncConnectionDialog() {
            : auth.incorrect_password
                ? localization::reinput_password[localization_language_index_]
                : localization::input_password[localization_language_index_];
-  } else if (auth.error == minirtc::JoinFailureKind::Throttled) {
+  } else if (auth.error == MiniRtcJoinFailureKind::Throttled) {
     text = localization::connection_auth_throttled[localization_language_index_];
-  } else if (auth.error == minirtc::JoinFailureKind::Busy) {
+  } else if (auth.error == MiniRtcJoinFailureKind::Busy) {
     text = localization::connection_service_busy[localization_language_index_];
-  } else if (auth.error == minirtc::JoinFailureKind::NotAuthenticated) {
+  } else if (auth.error == MiniRtcJoinFailureKind::NotAuthenticated) {
     text = localization::connection_not_authenticated[localization_language_index_];
   } else {
     text = props->lan_session_ && !props->lan_session_->error.empty()
@@ -4782,20 +4782,20 @@ void GuiApplication::SyncFileTransferNotifications() {
 
 bool GuiApplication::ValidateSelfHostedSettingsFromUi(bool gallery_window) {
   auto& main = ui_->Window(gallery_window);
-  const auto address = minirtc::ParseSignalServerAddress(
-      std::string(main->get_server_host()));
-  if (!address) {
+  const auto input = std::string(main->get_server_host());
+  MiniRtcSignalServerAddress address{};
+  if (ParseMiniRtcSignalServerAddress(input.data(), input.size(), &address) != 0) {
     main->set_self_host_settings_error(UiText(
         localization::self_hosted_address_invalid[localization_language_index_]));
     return false;
   }
-  const auto port = address->port ? address->port : ParsePort(main->get_server_port());
+  const auto port = address.port ? std::optional<int>(address.port) : ParsePort(main->get_server_port());
   if (!port) {
     main->set_self_host_settings_error(UiText(
         localization::self_hosted_port_invalid[localization_language_index_]));
     return false;
   }
-  main->set_server_host(UiText(address->Address()));
+  main->set_server_host(UiText(std::string(address.host) + address.target));
   main->set_server_port(UiText(std::to_string(*port)));
   main->set_self_host_settings_error("");
   return true;
diff --git a/apps/desktop/src/gui/runtime/announcement_inbox.cpp b/apps/desktop/src/gui/runtime/announcement_inbox.cpp
index 1183e7f9..1bf72c03 100644
--- a/apps/desktop/src/gui/runtime/announcement_inbox.cpp
+++ b/apps/desktop/src/gui/runtime/announcement_inbox.cpp
@@ -8,7 +8,7 @@
 #include <set>
 #include <system_error>
 
-#include "signal_server_address.h"
+#include <minirtc.h>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -53,12 +53,13 @@ void AnnouncementInbox::Configure(std::string host, int port,
   std::lock_guard<std::mutex> lock(mutex_);
   if (directory_.empty() || host.empty() || port <= 0 || device_id.empty())
     return;
-  auto address = minirtc::ParseSignalServerAddress(host);
-  if (!address) return;
-  for (auto& ch : address->host)
+  MiniRtcSignalServerAddress address{};
+  if (ParseMiniRtcSignalServerAddress(host.data(), host.size(), &address) != 0) return;
+  std::string normalized_host(address.host);
+  for (auto& ch : normalized_host)
     if (ch >= 'A' && ch <= 'Z') ch += 'a' - 'A';
-  if (address->host.back() == '.') address->host.pop_back();
-  host = address->Address();
+  if (normalized_host.back() == '.') normalized_host.pop_back();
+  host = normalized_host + address.target;
   const auto scope = json::array({host, port, device_id}).dump();
   if (scope_ == scope) return;
   scope_ = scope;
diff --git a/apps/desktop/src/gui/runtime/connection_auth_state.h b/apps/desktop/src/gui/runtime/connection_auth_state.h
index e87e1e41..9cee03fb 100644
--- a/apps/desktop/src/gui/runtime/connection_auth_state.h
+++ b/apps/desktop/src/gui/runtime/connection_auth_state.h
@@ -5,7 +5,8 @@
 #include <mutex>
 #include <string_view>
 
-#include "join_failure.h"
+#include <minirtc.h>
+#include <nlohmann/json.hpp>
 
 namespace crossdesk {
 
@@ -18,7 +19,7 @@ class ConnectionAuthState {
     bool password_required = false;
     bool validating = false;
     bool incorrect_password = false;
-    minirtc::JoinFailureKind error = minirtc::JoinFailureKind::Unknown;
+    MiniRtcJoinFailureKind error = MiniRtcJoinFailureKind::Unknown;
     int retry_after = 0;
   };
 
@@ -34,15 +35,16 @@ class ConnectionAuthState {
 
   void Rejected(const nlohmann::json& reply,
                 Clock::time_point now = Clock::now()) {
-    const auto failure = minirtc::ParseJoinFailure(reply);
+    const auto message = reply.dump();
+    const auto failure = ParseMiniRtcJoinFailure(message.data(), message.size());
     std::lock_guard lock(mutex_);
     state_ = {};
     state_.error = failure.kind;
     state_.incorrect_password =
-        failure.kind == minirtc::JoinFailureKind::AuthenticationFailed;
+        failure.kind == MiniRtcJoinFailureKind::AuthenticationFailed;
     state_.password_required =
         state_.incorrect_password ||
-        failure.kind == minirtc::JoinFailureKind::PasswordRequired;
+        failure.kind == MiniRtcJoinFailureKind::PasswordRequired;
     retry_at_ = now + std::chrono::seconds(failure.retry_after);
   }
 
diff --git a/apps/desktop/src/network/lan/lan_identity.cpp b/apps/desktop/src/network/lan/lan_identity.cpp
index 3099d87d..eb6bdb36 100644
--- a/apps/desktop/src/network/lan/lan_identity.cpp
+++ b/apps/desktop/src/network/lan/lan_identity.cpp
@@ -13,7 +13,7 @@
 #include <stdexcept>
 #include <string_view>
 
-#include "direct_address.h"
+#include <minirtc.h>
 #include "lan_password.h"
 #ifdef _WIN32
 // Winsock must precede windows.h; the networking headers need its types.
@@ -212,12 +212,14 @@ unsigned ParsePort(const std::string& value) {
   return port;
 }
 bool IsIpAddress(const std::string& value) {
-  return minirtc::ParseDirectAddress(value).has_value();
+  char normalized[129]{};
+  return NormalizeMiniRtcDirectAddress(value.data(), value.size(), normalized, sizeof(normalized)) == 0;
 }
 std::string NormalizeAddress(const std::string& value) {
-  const auto address = minirtc::ParseDirectAddress(value);
-  Require(address.has_value(), "Invalid LAN endpoint");
-  return minirtc::DirectAddressString(*address);
+  char normalized[129]{};
+  Require(NormalizeMiniRtcDirectAddress(value.data(), value.size(), normalized, sizeof(normalized)) == 0,
+          "Invalid LAN endpoint");
+  return normalized;
 }
 std::string FormatEndpoint(const std::string& address, unsigned port) {
   return (address.find(':') == std::string::npos ? address
diff --git a/apps/desktop/src/network/lan/lan_transport.cpp b/apps/desktop/src/network/lan/lan_transport.cpp
index e99367b5..7c3ebaa6 100644
--- a/apps/desktop/src/network/lan/lan_transport.cpp
+++ b/apps/desktop/src/network/lan/lan_transport.cpp
@@ -13,7 +13,7 @@
 #include <websocketpp/config/asio_client.hpp>
 #include <websocketpp/server.hpp>
 
-#include "direct_address.h"
+#include <minirtc.h>
 
 namespace crossdesk::lan {
 namespace {
@@ -147,7 +147,11 @@ bool SupportsDualStack() {
 std::string SocketAddress(asio::ip::address address) {
   if (address.is_v6() && address.to_v6().is_v4_mapped())
     address = asio::ip::make_address_v4(asio::ip::v4_mapped, address.to_v6());
-  return minirtc::DirectAddressString(address);
+  if (address.is_v4()) return address.to_string();
+  auto ipv6 = address.to_v6();
+  const auto scope = ipv6.scope_id();
+  ipv6.scope_id(0);
+  return ipv6.to_string() + (scope ? "%" + std::to_string(scope) : "");
 }
 std::shared_ptr<Context> TlsContext() {
   auto context = std::make_shared<Context>(Context::tls);
@@ -323,7 +327,8 @@ struct Transport::Impl {
       c->local_address = SocketAddress(local.address());
       c->remote_address = SocketAddress(remote.address());
       const auto interfaces = LocalIpInterfaces();
-      if (!minirtc::IsDirectAddressPair(c->local_address, c->remote_address) ||
+      if (IsMiniRtcDirectAddressPair(c->local_address.data(), c->local_address.size(),
+                                    c->remote_address.data(), c->remote_address.size()) != 1 ||
           std::none_of(
               interfaces.begin(), interfaces.end(),
               [&](const auto& i) { return i.address == c->local_address; })) {
diff --git a/apps/desktop/src/platform/linux/headless/headless_settings.cpp b/apps/desktop/src/platform/linux/headless/headless_settings.cpp
index 60074fe8..01ae8afd 100644
--- a/apps/desktop/src/platform/linux/headless/headless_settings.cpp
+++ b/apps/desktop/src/platform/linux/headless/headless_settings.cpp
@@ -10,7 +10,7 @@
 #include <optional>
 
 #include "config_center.h"
-#include "signal_server_address.h"
+#include <minirtc.h>
 #include "signal_server_settings.h"
 
 namespace crossdesk {
@@ -88,7 +88,8 @@ SettingResult ApplyConsoleSetting(ConfigCenter& config, const std::string& key,
     canonical = value;
     save = [&config, mode] { return config.SetTurnMode(static_cast<ConfigCenter::TURN_MODE>(mode)); };
   } else if (key == "server_host") {
-    if (!minirtc::ParseSignalServerAddress(input)) return result;
+    MiniRtcSignalServerAddress address{};
+    if (ParseMiniRtcSignalServerAddress(input.data(), input.size(), &address) != 0) return result;
     save = [&] { return config.SetServerHost(input); };
   } else if (key == "server_port") {
     int port = 0;
diff --git a/apps/harmony/native/mobile_session.cpp b/apps/harmony/native/mobile_session.cpp
index 3fc9c401..9471bd83 100644
--- a/apps/harmony/native/mobile_session.cpp
+++ b/apps/harmony/native/mobile_session.cpp
@@ -7,7 +7,6 @@
 #include <mobile_file_transfer_session.h>
 #include <mobile_video_timing.h>
 #include <display_stream_id.h>
-#include <log.h>
 #include <libyuv.h>
 #include <algorithm>
 #include <cmath>
@@ -257,7 +256,9 @@ class MobileSession {
       preview_directory_=v.at("previewDirectory").get<std::string>();
       if (server_.empty()||server_.size()>=256||server_.find('@')!=std::string::npos||port_<1||port_>65535||
           logs_.size()>=256||roots.empty()||directory_.empty()) throw std::runtime_error("Invalid configuration");
-      setenv("SSL_CERT_DIR",roots.c_str(),1); minirtc::InitLogger(logs_); minirtc::get_logger()->set_level(spdlog::level::off);
+      setenv("SSL_CERT_DIR",roots.c_str(),1);
+      if (ConfigureMiniRtcLogging(MiniRtcLogOff, nullptr, nullptr) != 0)
+        throw std::runtime_error("Unable to configure MiniRTC logging");
       identity_context_=std::make_unique<Context>(Context{this,false,session_});
       auto p=Parameters(false); identity_=CreatePeer(&p); signal_started_=Clock::now();
       if (!identity_||Init(identity_)!=0) { throw std::runtime_error("Identity initialization failed"); }
diff --git a/apps/harmony/native/xmake.lua b/apps/harmony/native/xmake.lua
index 2205fa44..68881e46 100644
--- a/apps/harmony/native/xmake.lua
+++ b/apps/harmony/native/xmake.lua
@@ -10,7 +10,7 @@ target("crossdesk_harmony_mobile")
     set_kind("shared")
     set_default(false)
     add_deps("minirtc")
-    add_packages("nlohmann_json", "libyuv", "spdlog")
+    add_packages("nlohmann_json", "libyuv")
     add_files("mobile_session.cpp", "media.cpp", "audio.cpp", "../../../libs/wire/src/remote_action.cpp", "../../../libs/wire/src/file_transfer.cpp", "../../../libs/wire/src/app_version.cpp")
     -- Export only the bridge API; bundled static dependencies are internal.
     add_cxflags("-fvisibility=hidden", "-fvisibility-inlines-hidden")
diff --git a/deps/submodules/minirtc b/deps/submodules/minirtc
index f67e251a..25ae2403 160000
--- a/deps/submodules/minirtc
+++ b/deps/submodules/minirtc
@@ -1 +1 @@
-Subproject commit f67e251af32fe74029f249ef393336db2f1a8ff2
+Subproject commit 25ae240374083611516ff2c3641154903150ac62
diff --git a/libs/controller/include/controller_diagnostics.h b/libs/controller/include/controller_diagnostics.h
index 3a25745d..f1075795 100644
--- a/libs/controller/include/controller_diagnostics.h
+++ b/libs/controller/include/controller_diagnostics.h
@@ -11,6 +11,7 @@
 
 namespace crossdesk {
 void InitializeControllerDiagnostics(const std::string &directory);
+void WriteControllerDiagnostic(const std::string &message) noexcept;
 }
 
 #endif
diff --git a/libs/controller/src/controller_diagnostics.cpp b/libs/controller/src/controller_diagnostics.cpp
index fecb072c..095e4c15 100644
--- a/libs/controller/src/controller_diagnostics.cpp
+++ b/libs/controller/src/controller_diagnostics.cpp
@@ -1,19 +1,22 @@
 #include "controller_diagnostics.h"
-#include <log.h>
+#include <minirtc.h>
+#include <spdlog/details/log_msg.h>
+#include <spdlog/sinks/rotating_file_sink.h>
+#include <memory>
+#include <mutex>
+#include <stdexcept>
 #include <string_view>
 
 namespace crossdesk {
 namespace {
 // Signaling errors and SDP can contain credentials. Only audited transport
 // events reach this sink; arbitrary MiniRTC messages remain suppressed.
-std::string DiagnosticEvent(const spdlog::details::log_msg &message) {
-  std::string_view source = message.source.filename ? message.source.filename : "";
+std::string DiagnosticEvent(const MiniRtcLogRecord &message) {
+  std::string_view source = message.source_file ? message.source_file : "";
   const auto slash = source.find_last_of("/\\");
   if (slash != std::string_view::npos)
     source.remove_prefix(slash + 1);
-  const std::string_view text(message.payload.data(), message.payload.size());
-  if (source == "controller_session.cpp")
-    return std::string(text); // Local states/counters only at these call sites.
+  const std::string_view text(message.message, message.message_size);
   if (source == "ws_client.cpp") {
     if (text == "WebSocket connection opened") return std::string(text);
     // These call sites contain library category names, numeric codes and retry
@@ -59,30 +62,56 @@ std::string DiagnosticEvent(const spdlog::details::log_msg &message) {
   return {};
 }
 
-class DiagnosticSink final : public spdlog::sinks::base_sink<std::mutex> {
+class DiagnosticWriter {
 public:
-  explicit DiagnosticSink(const std::string &directory)
+  explicit DiagnosticWriter(const std::string &directory)
       : file_(directory + "/transport.log", 1024 * 1024, 2) {}
-
-private:
-  void sink_it_(const spdlog::details::log_msg &message) override {
-    const auto event = DiagnosticEvent(message);
-    if (event.empty())
-      return;
-    auto sanitized = message;
-    sanitized.payload = spdlog::string_view_t(event.data(), event.size());
-    file_.log(sanitized);
+  void Write(const std::string &event, const MiniRtcLogRecord *record = nullptr) {
+    if (event.empty()) return;
+    spdlog::details::log_msg message("crossdesk", spdlog::level::info, event);
+    if (record) {
+      message.level = static_cast<spdlog::level::level_enum>(record->level);
+      message.time = spdlog::log_clock::time_point(std::chrono::microseconds(record->timestamp_us));
+      message.source = {record->source_file, record->source_line, ""};
+    }
+    file_.log(message);
     file_.flush();
   }
-  void flush_() override { file_.flush(); }
+private:
   spdlog::sinks::rotating_file_sink_mt file_;
 };
+void ReceiveLog(const MiniRtcLogRecord *message, void *context) {
+  if (message) static_cast<DiagnosticWriter *>(context)->Write(DiagnosticEvent(*message), message);
+}
+struct Diagnostics {
+  std::mutex initialization, mutex;
+  std::shared_ptr<DiagnosticWriter> writer;
+  ~Diagnostics() {
+    // Quiesce the callback before releasing its application-owned context.
+    ConfigureMiniRtcLogging(MiniRtcLogOff, nullptr, nullptr);
+  }
+};
+Diagnostics &State() {
+  static Diagnostics state;
+  return state;
+}
 } // namespace
 
 void InitializeControllerDiagnostics(const std::string &directory) {
-  auto sink = std::make_shared<DiagnosticSink>(directory);
-  minirtc::InitLogger(directory, std::move(sink));
-  auto logger = minirtc::get_logger();
-  logger->set_level(spdlog::level::info);
+  auto &state = State();
+  std::lock_guard initialize(state.initialization);
+  auto writer = std::make_shared<DiagnosticWriter>(directory);
+  if (ConfigureMiniRtcLogging(MiniRtcLogInfo, ReceiveLog, writer.get()) != 0)
+    throw std::runtime_error("Unable to configure MiniRTC diagnostics");
+  std::lock_guard lock(state.mutex);
+  state.writer = std::move(writer);
+}
+void WriteControllerDiagnostic(const std::string &message) noexcept {
+  try {
+    auto &state = State();
+    std::shared_ptr<DiagnosticWriter> writer;
+    { std::lock_guard lock(state.mutex); writer = state.writer; }
+    if (writer) writer->Write(message);
+  } catch (...) {}
 }
 } // namespace crossdesk
diff --git a/libs/controller/src/controller_session.cpp b/libs/controller/src/controller_session.cpp
index 0e7e20e4..f6414497 100644
--- a/libs/controller/src/controller_session.cpp
+++ b/libs/controller/src/controller_session.cpp
@@ -5,7 +5,6 @@
 #include <cstdio>
 #include <cstring>
 #include <display_stream_id.h>
-#include <log.h>
 #include <preview_subscription.h>
 #include <stdexcept>
 #include <stream_names.h>
@@ -159,7 +158,7 @@ void ControllerSession::Connect(SessionOptions options, std::string device,
   // Never register a desktop identity or persist local credentials.
   client_id_.clear();
   InitializeControllerDiagnostics(options_.log_directory);
-  SPDLOG_LOGGER_INFO(minirtc::get_logger(), "Session registering");
+  WriteControllerDiagnostic("Session registering");
   auto p = Parameters();
   peer_ = CreatePeer(&p);
   if (!peer_) {
@@ -198,7 +197,7 @@ void ControllerSession::Tick() {
     if (Finished())
       break;
     if (e.kind == 0) {
-      SPDLOG_LOGGER_INFO(minirtc::get_logger(), "Signal status: {}", e.code);
+      WriteControllerDiagnostic("Signal status: " + std::to_string(e.code));
       if (e.code == SignalTlsCertError) {
         Fail("tls_certificate_error");
         break;
@@ -210,8 +209,7 @@ void ControllerSession::Tick() {
       // The initial signaling transport can recover before a remote join is
       // sent. Keep its backoff worker alive within the original deadline.
       if (e.code == SignalReconnecting && state_ == "registering") {
-        SPDLOG_LOGGER_INFO(minirtc::get_logger(),
-                          "Initial signaling retry within connection deadline");
+        WriteControllerDiagnostic("Initial signaling retry within connection deadline");
         continue;
       }
       if (e.code == SignalClosed || e.code == SignalServerClosed ||
@@ -236,8 +234,7 @@ void ControllerSession::Tick() {
         password_.clear();
       }
     } else if (e.kind == 1) {
-      SPDLOG_LOGGER_INFO(minirtc::get_logger(), "Connection status: {} (session {})",
-                         e.code, state_);
+      WriteControllerDiagnostic("Connection status: " + std::to_string(e.code) + " (session " + state_ + ")");
       if (e.code == ::Connected && !Connected()) {
         state_ = "connected";
         auto hello = MakeHostInformation("CrossDesk CLI", {}, false);
@@ -365,8 +362,7 @@ void ControllerSession::ClosePeers() {
   password_.clear();
 }
 void ControllerSession::Fail(const char *reason) {
-  SPDLOG_LOGGER_INFO(minirtc::get_logger(), "Session failed: {} (stage {})",
-                     reason, state_);
+  WriteControllerDiagnostic("Session failed: " + std::string(reason) + " (stage " + state_ + ")");
   ReleaseInput();
   error_ = reason;
   state_ = "failed";
@@ -449,7 +445,7 @@ void ControllerSession::Preview() {
 }
 void ControllerSession::SetControl(bool enabled) {
   if (control_ != enabled)
-    SPDLOG_LOGGER_INFO(minirtc::get_logger(), "Remote control: {}", enabled);
+    WriteControllerDiagnostic(std::string("Remote control: ") + (enabled ? "true" : "false"));
   if (!enabled)
     ReleaseInput();
   control_ = enabled;