diff --git a/lib/BoardFinder/BoardFinder.cpp b/lib/BoardFinder/BoardFinder.cpp
index 00cfc57..2276da5 100644
--- a/lib/BoardFinder/BoardFinder.cpp
+++ b/lib/BoardFinder/BoardFinder.cpp
@@ -25,7 +25,7 @@ BoardConfig const *BoardFinder::searchBoardConfig(logging::Logger &logger) {
       continue;
     }
     if (checkOledConfig(boardconf, logger)) {
-      logger.log(logging::LoggerLevel::LOGGER_LEVEL_INFO, MODULE_NAME, "found a board config: %s", boardconf->Name);
+      logger.log(logging::LoggerLevel::LOGGER_LEVEL_INFO, MODULE_NAME, "found a board config: %s", boardconf->Name.c_str());
       return boardconf;
     }
   }
@@ -40,7 +40,7 @@ BoardConfig const *BoardFinder::searchBoardConfig(logging::Logger &logger) {
       powerManagement.activateLoRa();
     }
     if (checkModemConfig(boardconf)) {
-      logger.log(logging::LoggerLevel::LOGGER_LEVEL_INFO, MODULE_NAME, "found a board config: %s", boardconf->Name);
+      logger.log(logging::LoggerLevel::LOGGER_LEVEL_INFO, MODULE_NAME, "found a board config: %s", boardconf->Name.c_str());
       return boardconf;
     }
   }
diff --git a/lib/System/TaskManager.cpp b/lib/System/TaskManager.cpp
index d149e2f..b643c1e 100644
--- a/lib/System/TaskManager.cpp
+++ b/lib/System/TaskManager.cpp
@@ -24,11 +24,11 @@ std::list<Task *> TaskManager::getTasks() {
 bool TaskManager::setup(System &system) {
   system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, MODULE_NAME, "will setup all tasks...");
   for (Task *elem : _alwaysRunTasks) {
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, MODULE_NAME, "call setup for %s", elem->getName());
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, MODULE_NAME, "call setup for %s", elem->getName().c_str());
     elem->setup(system);
   }
   for (Task *elem : _tasks) {
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, MODULE_NAME, "call setup for %s", elem->getName());
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, MODULE_NAME, "call setup for %s", elem->getName().c_str());
     elem->setup(system);
   }
   _nextTask = _tasks.begin();
diff --git a/src/LoRa_APRS_iGate.cpp b/src/LoRa_APRS_iGate.cpp
index d795da2..74a313d 100644
--- a/src/LoRa_APRS_iGate.cpp
+++ b/src/LoRa_APRS_iGate.cpp
@@ -81,7 +81,7 @@ void setup() {
     }
   }
 
-  LoRaSystem.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, MODULE_NAME, "Board %s loaded.", boardConfig->Name);
+  LoRaSystem.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, MODULE_NAME, "Board %s loaded.", boardConfig->Name.c_str());
 
   if (boardConfig->Type == eTTGO_T_Beam_V1_0) {
     Wire.begin(boardConfig->OledSda, boardConfig->OledScl);
diff --git a/src/TaskAprsIs.cpp b/src/TaskAprsIs.cpp
index 86ef766..680a2c4 100644
--- a/src/TaskAprsIs.cpp
+++ b/src/TaskAprsIs.cpp
@@ -41,7 +41,7 @@ bool AprsIsTask::loop(System &system) {
 }
 
 bool AprsIsTask::connect(System &system) {
-  system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "connecting to APRS-IS server: %s on port: %d", system.getUserConfig()->aprs_is.server, system.getUserConfig()->aprs_is.port);
+  system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "connecting to APRS-IS server: %s on port: %d", system.getUserConfig()->aprs_is.server.c_str(), system.getUserConfig()->aprs_is.port);
   APRS_IS::ConnectionStatus status = _aprs_is.connect(system.getUserConfig()->aprs_is.server, system.getUserConfig()->aprs_is.port);
   if (status == APRS_IS::ERROR_CONNECTION) {
     system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_ERROR, getName(), "Something went wrong on connecting! Is the server reachable?");
diff --git a/src/TaskEth.cpp b/src/TaskEth.cpp
index d5a15ee..03f211f 100644
--- a/src/TaskEth.cpp
+++ b/src/TaskEth.cpp
@@ -24,11 +24,11 @@ void WiFiEvent(WiFiEvent_t event) {
     _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "WiFi Connected");
     break;
   case SYSTEM_EVENT_STA_GOT_IP:
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "WiFi MAC: %s", WiFi.macAddress());
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "IPv4: %s", WiFi.localIP().toString());
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "Gateway: %s", WiFi.gatewayIP().toString());
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "DNS1: %s", WiFi.dnsIP().toString());
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "DNS2: %s", WiFi.dnsIP(1).toString());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "WiFi MAC: %s", WiFi.macAddress().c_str());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "IPv4: %s", WiFi.localIP().toString().c_str());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "Gateway: %s", WiFi.gatewayIP().toString().c_str());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "DNS1: %s", WiFi.dnsIP().toString().c_str());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "DNS2: %s", WiFi.dnsIP(1).toString().c_str());
     break;
   case SYSTEM_EVENT_STA_DISCONNECTED:
     _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "WiFi Disconnected");
@@ -44,11 +44,11 @@ void WiFiEvent(WiFiEvent_t event) {
     break;
   case SYSTEM_EVENT_ETH_GOT_IP:
     _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "Hostname: %s", ETH.getHostname());
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "ETH MAC: %s", ETH.macAddress());
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "IPv4: %s", ETH.localIP().toString());
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "Gateway: %s", ETH.gatewayIP().toString());
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "DNS1: %s", ETH.dnsIP().toString());
-    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "DNS2: %s", ETH.dnsIP(1).toString());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "ETH MAC: %s", ETH.macAddress().c_str());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "IPv4: %s", ETH.localIP().toString().c_str());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "Gateway: %s", ETH.gatewayIP().toString().c_str());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "DNS1: %s", ETH.dnsIP().toString().c_str());
+    _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "DNS2: %s", ETH.dnsIP(1).toString().c_str());
     _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "Hostname: %s", ETH.getHostname());
     if (ETH.fullDuplex()) {
       _logger->log(logging::LoggerLevel::LOGGER_LEVEL_INFO, WIFI_EVENT, "FULL_DUPLEX");
diff --git a/src/TaskFTP.cpp b/src/TaskFTP.cpp
index e4a6037..86e0bef 100644
--- a/src/TaskFTP.cpp
+++ b/src/TaskFTP.cpp
@@ -14,7 +14,7 @@ FTPTask::~FTPTask() {
 
 bool FTPTask::setup(System &system) {
   for (Configuration::Ftp::User user : system.getUserConfig()->ftp.users) {
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "Adding user to FTP Server: %s", user.name);
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "Adding user to FTP Server: %s", user.name.c_str());
     _ftpServer.addUser(user.name, user.password);
   }
   _ftpServer.addFilesystem("SPIFFS", &SPIFFS);
diff --git a/src/TaskMQTT.cpp b/src/TaskMQTT.cpp
index aa0a7a0..fe6ee3f 100644
--- a/src/TaskMQTT.cpp
+++ b/src/TaskMQTT.cpp
@@ -46,7 +46,7 @@ bool MQTTTask::loop(System &system) {
       topic = topic + "/";
     }
     topic = topic + system.getUserConfig()->callsign;
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "Send MQTT with topic: '%s', data: %s", topic, r);
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "Send MQTT with topic: '%s', data: %s", topic.c_str(), r.c_str());
     _MQTT.publish(topic.c_str(), r.c_str());
   }
   _MQTT.loop();
@@ -54,9 +54,9 @@ bool MQTTTask::loop(System &system) {
 }
 
 bool MQTTTask::connect(System &system) {
-  system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "Connecting to MQTT broker: %s on port %d", system.getUserConfig()->mqtt.server, system.getUserConfig()->mqtt.port);
+  system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "Connecting to MQTT broker: %s on port %d", system.getUserConfig()->mqtt.server.c_str(), system.getUserConfig()->mqtt.port);
   if (_MQTT.connect(system.getUserConfig()->callsign.c_str(), system.getUserConfig()->mqtt.name.c_str(), system.getUserConfig()->mqtt.password.c_str())) {
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "Connected to MQTT broker as: %s", system.getUserConfig()->callsign);
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "Connected to MQTT broker as: %s", system.getUserConfig()->callsign.c_str());
     return true;
   }
   system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "Connecting to MQTT broker failed. Try again later.");
diff --git a/src/TaskModem.cpp b/src/TaskModem.cpp
index 645626b..ca0784d 100644
--- a/src/TaskModem.cpp
+++ b/src/TaskModem.cpp
@@ -39,19 +39,19 @@ bool ModemTask::setup(System &system) {
 bool ModemTask::loop(System &system) {
   if (_lora_aprs.checkMessage()) {
     std::shared_ptr<APRSMessage> msg = _lora_aprs.getMessage();
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "[%s] Received packet '%s' with RSSI %d and SNR %f", timeString(), msg->toString(), _lora_aprs.packetRssi(), _lora_aprs.packetSnr());
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "[%s] Received packet '%s' with RSSI %d and SNR %f", timeString().c_str(), msg->toString().c_str(), _lora_aprs.packetRssi(), _lora_aprs.packetSnr());
     _fromModem.addElement(msg);
-    system.getDisplay().addFrame(std::shared_ptr<DisplayFrame>(new TextFrame("LoRa", msg->toString())));
+    system.getDisplay().addFrame(std::shared_ptr<DisplayFrame>(new TextFrame("LoRa", msg->toString().c_str())));
   }
 
   if (!_toModem.empty()) {
     std::shared_ptr<APRSMessage> msg = _toModem.getElement();
     if (system.getUserConfig()->lora.tx_enable) {
-      system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "[%s] Transmitting packet '%s'", timeString(), msg->toString());
+      system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "[%s] Transmitting packet '%s'", timeString().c_str(), msg->toString().c_str());
       _lora_aprs.sendMessage(msg);
-      system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "[%s] TX done", timeString());
+      system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "[%s] TX done", timeString().c_str());
     } else {
-      system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "[%s] NOT transmitting packet as TX is not enabled '%s'", timeString(), msg->toString());
+      system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "[%s] NOT transmitting packet as TX is not enabled '%s'", timeString().c_str(), msg->toString().c_str());
     }
   }
 
diff --git a/src/TaskNTP.cpp b/src/TaskNTP.cpp
index c012ae8..569eecc 100644
--- a/src/TaskNTP.cpp
+++ b/src/TaskNTP.cpp
@@ -27,7 +27,7 @@ bool NTPTask::loop(System &system) {
   }
   if (_ntpClient.update()) {
     setTime(_ntpClient.getEpochTime());
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "Current time: %s", _ntpClient.getFormattedTime());
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "Current time: %s", _ntpClient.getFormattedTime().c_str());
   }
   _stateInfo = _ntpClient.getFormattedTime();
   _state     = Okay;
diff --git a/src/TaskOTA.cpp b/src/TaskOTA.cpp
index 28dcb85..89cbf7f 100644
--- a/src/TaskOTA.cpp
+++ b/src/TaskOTA.cpp
@@ -18,7 +18,7 @@ bool OTATask::setup(System &system) {
         } else { // U_SPIFFS
           type = "filesystem";
         }
-        system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "Start updating %s", type);
+        system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "Start updating %s", type.c_str());
       })
       .onEnd([&]() {
         system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "OTA End");
@@ -39,7 +39,7 @@ bool OTATask::setup(System &system) {
         } else if (error == OTA_END_ERROR) {
           error_str = "End Failed";
         }
-        system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_ERROR, getName(), "Error[%d]: %s", error, error_str);
+        system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_ERROR, getName(), "Error[%d]: %s", error, error_str.c_str());
       });
   if (system.getUserConfig()->network.hostname.overwrite) {
     _ota.setHostname(system.getUserConfig()->network.hostname.name.c_str());
diff --git a/src/TaskRouter.cpp b/src/TaskRouter.cpp
index 25cf38d..96b13dc 100644
--- a/src/TaskRouter.cpp
+++ b/src/TaskRouter.cpp
@@ -47,7 +47,7 @@ bool RouterTask::loop(System &system) {
 
         aprsIsMsg->setPath(path + "qAO," + system.getUserConfig()->callsign);
 
-        system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "APRS-IS: %s", aprsIsMsg->toString());
+        system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "APRS-IS: %s", aprsIsMsg->toString().c_str());
         _toAprsIs.addElement(aprsIsMsg);
       } else {
         system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "APRS-IS: no forward => RFonly");
@@ -71,7 +71,7 @@ bool RouterTask::loop(System &system) {
         // fixme
         digiMsg->setPath(system.getUserConfig()->callsign + "*");
 
-        system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "DIGI: %s", digiMsg->toString());
+        system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "DIGI: %s", digiMsg->toString().c_str());
 
         _toModem.addElement(digiMsg);
       }
@@ -80,7 +80,7 @@ bool RouterTask::loop(System &system) {
 
   // check for beacon
   if (_beacon_timer.check()) {
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "[%s] %s", timeString(), _beaconMsg->encode());
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_INFO, getName(), "[%s] %s", timeString().c_str(), _beaconMsg->encode().c_str());
 
     if (system.getUserConfig()->aprs_is.active)
       _toAprsIs.addElement(_beaconMsg);
diff --git a/src/TaskWifi.cpp b/src/TaskWifi.cpp
index fb01baf..d7e1868 100644
--- a/src/TaskWifi.cpp
+++ b/src/TaskWifi.cpp
@@ -31,7 +31,7 @@ bool WifiTask::setup(System &system) {
   }
 
   for (Configuration::Wifi::AP ap : system.getUserConfig()->wifi.APs) {
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "Looking for AP: %s", ap.SSID);
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "Looking for AP: %s", ap.SSID.c_str());
     _wiFiMulti.addAP(ap.SSID.c_str(), ap.password.c_str());
   }
   return true;
@@ -47,7 +47,7 @@ bool WifiTask::loop(System &system) {
     _state         = Error;
     return false;
   } else if (wifi_status != _oldWifiStatus) {
-    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "IP address: %s", WiFi.localIP().toString());
+    system.getLogger().log(logging::LoggerLevel::LOGGER_LEVEL_DEBUG, getName(), "IP address: %s", WiFi.localIP().toString().c_str());
     _oldWifiStatus = wifi_status;
     return false;
   }