diff --git a/CHANGES b/CHANGES
index 6b2c712..a94ac1e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,32 @@
 
+IMPORTANT CHANGES THAT MIGHT AFFECT YOU!
+
+** No udev rules
+
+Wmbusmeters new default behaviour is to NOT exit if no wmbus
+device is found. It stays running all the time even if no
+wmbus device is detected. As soon as a device is inserted
+it will detect/configure and start using the device.
+
+When reading stdin and files, then wmbusmeters will exit
+as soon as there is no more data.
+
+This means that the udev rules no longer are needed and must be
+removed. This will be done automatically by the install script.
+
+** Use stderr for logging, stdout for data.
+
+wmbusmeters now uses STDERR as default for info/verbose/debug/trace output.
+This will not affect you if you run wmbusmeters as a daemon,
+but if you start wmbusmeters yourself you should check where stderr is going.
+To use the old style add --usestdoutforlogging.
+
+** New features
+
 To list the shell envs for a meter do --listenvs=multical21
 To list the fields avilable for a meter do --listfields=multical21
+To list all meters do --listmeters
+To search for a meter do --listmeters=water or --listmeters=multi
 
 Version 0.9.36: 2020-09-08
 
diff --git a/README.md b/README.md
index ee20de3..887de41 100644
--- a/README.md
+++ b/README.md
@@ -142,6 +142,9 @@ Usage: wmbusmeters {options} <device>{:suffix} ( [meter_name] [meter_type]{:<mod
 As <options> you can use:
 
     --addconversions=<unit>+ add conversion to these units to json and meter env variables (GJ)
+    --alarmexpectedactivity=mon-fri(08-17) Specify when the timeout is tested, default is mon-sun(00-23)
+    --alarmshell=<cmdline> invokes cmdline when an alarm triggers
+    --alarmtimeout=<time> Expect a telegram to arrive within <time> seconds, eg 60s, 60m, 24h during expected activity.
     --debug for a lot of information
     --exitafter=<time> exit program after time, eg 20h, 10m 5s
     --format=<hr/json/fields> for human readable, json or semicolon separated fields
diff --git a/install.sh b/install.sh
index 40e23cd..f4b151e 100755
--- a/install.sh
+++ b/install.sh
@@ -74,8 +74,6 @@ echo man page: installed "$ROOT"/usr/share/man/man1/wmbusmeters.1.gz
 ## Create wmbusmeters user
 ##
 
-ID=$(id -u wmbusmeters 2>/dev/null)
-
 if [ -f "$ROOT"/usr/sbin/nologin ]
 then
 	USERSHELL="$ROOT/usr/sbin/nologin"
@@ -88,15 +86,17 @@ fi
 
 if [ "$ADDUSER" = "true" ]
 then
+    # Create the wmbusmeters group, if it does not already exist.
+    groupadd -f wmbusmeters
+
+    ID=$(id -u wmbusmeters 2>/dev/null)
     if [ -z "$ID" ]
     then
-        # Create the wmbusmeters group, if it does not already exist.
-        groupadd -f wmbusmeters
         # Create the wmbusmeters user
-        useradd --system --shell $USERSHELL -g wmbusmeters --groups dialout wmbusmeters
+        useradd --system --shell $USERSHELL -g wmbusmeters wmbusmeters
         echo user: added wmbusmeters
     else
-        echo user: wmbusmeters unmodified
+        echo user: wmbusmeters already exists
     fi
 
     if [ "$(groups wmbusmeters | grep -o dialout)" = "" ]
@@ -107,6 +107,16 @@ then
     else
         echo user: wmbusmeters already added to dialout
     fi
+
+    if [ "$(groups wmbusmeters | grep -o plugdev)" = "" ]
+    then
+        # Add the wmbusmeters user to plugdev
+        usermod -a -G plugdev wmbusmeters
+        echo user: added wmbusmeters to plugdev group
+    else
+        echo user: wmbusmeters already added to plugdev
+    fi
+
     if [ ! -z "$SUDO_USER" ]
     then
         if [ "$(groups $SUDO_USER | grep -o wmbusmeters)" = "" ]
@@ -236,7 +246,7 @@ fi
 # This means that wmbusmeters will rely on the conf file device setting.
 cat <<'EOF' > $CURR_WMBS
 [Unit]
-Description="wmbusmeters service (no udev trigger)"
+Description="wmbusmeters service"
 Documentation=https://github.com/weetmuts/wmbusmeters
 Documentation=man:wmbusmeters(1)
 After=network.target
diff --git a/simulations/simulation_alarm.txt b/simulations/simulation_alarm.txt
index 7b8f07b..55a16af 100644
--- a/simulations/simulation_alarm.txt
+++ b/simulations/simulation_alarm.txt
@@ -1,4 +1,4 @@
 telegram=|2A442D2C998734761B168D2091D37CAC21576C78|02FF207100041308190000441308190000615B7F616713|+0
 {"media":"cold water","meter":"multical21","name":"MyTapWater","id":"76348799","total_m3":6.408,"target_m3":6.408,"max_flow_m3h":0,"flow_temperature_c":127,"external_temperature_c":19,"current_status":"DRY","time_dry":"22-31 days","time_reversed":"","time_leaking":"","time_bursting":"","timestamp":"1111-11-11T11:11:11Z"}
-telegram=|2A442D2C998734761B168D2091D37CAC21576C78|02FF207100041308190000441308190000615B7F616713|+3
+telegram=|2A442D2C998734761B168D2091D37CAC21576C78|02FF207100041308190000441308190000615B7F616713|+5
 {"media":"cold water","meter":"multical21","name":"MyTapWater","id":"76348799","total_m3":6.408,"target_m3":6.408,"max_flow_m3h":0,"flow_temperature_c":127,"external_temperature_c":19,"current_status":"DRY","time_dry":"22-31 days","time_reversed":"","time_leaking":"","time_bursting":"","timestamp":"1111-11-11T11:11:11Z"}
diff --git a/src/admin.cc b/src/admin.cc
index 4a607e2..e6f02cc 100644
--- a/src/admin.cc
+++ b/src/admin.cc
@@ -72,7 +72,6 @@ LIST_OF_WMBUS_RECEIVERS
 bool detectIfRoot();
 string userName();
 bool detectIfMemberOfGroup(string group);
-void detectProcesses(string cmd, vector<int> *pids);
 void detectWMBUSReceiver();
 void resetWMBUSReceiver();
 void probeFor(string type, AccessCheck(*func)(string,Detected*,SerialCommunicationManager*));
@@ -359,24 +358,6 @@ bool detectIfMemberOfGroup(string group)
     return false;
 }
 
-void detectProcesses(string cmd, vector<int> *pids)
-{
-    vector<string> args;
-    vector<string> envs;
-    args.push_back(cmd);
-    string out;
-    invokeShellCaptureOutput("/bin/pidof", args, envs, &out, true);
-
-    char buf[out.size()+1];
-    strcpy(buf, out.c_str());
-    char *pch;
-    pch = strtok (buf," \n");
-    while (pch != NULL)
-    {
-        pids->push_back(atoi(pch));
-        pch = strtok (NULL, " \n");
-    }
-}
 
 void stopDaemon()
 {
diff --git a/src/main.cc b/src/main.cc
index e8b879f..3ad6b3f 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -20,6 +20,7 @@
 #include"meters.h"
 #include"printer.h"
 #include"serial.h"
+#include"shell.h"
 #include"util.h"
 #include"version.h"
 #include"wmbus.h"
@@ -49,6 +50,7 @@ void logStartInformation(Configuration *config);
 bool start(Configuration *config);
 void startUsingConfigFiles(string root, bool is_daemon, string device_override, string listento_override);
 void startDaemon(string pid_file, string device_override, string listento_override); // Will use config files.
+void checkIfMultipleWmbusmetersRunning();
 void list_shell_envs(Configuration *config, string meter_type);
 void list_fields(Configuration *config, string meter_type);
 void list_meters(Configuration *config);
@@ -81,6 +83,9 @@ set<string> not_swradio_wmbus_devices_;
 // it has been read, do not open it again!
 set<string> do_not_open_file_again_;
 
+// Store simulation files here.
+set<string> simulation_files_;
+
 // Rendering the telegrams to json,fields or shell calls is
 // done by the printer.
 unique_ptr<Printer> printer_;
@@ -150,14 +155,15 @@ provided you with this binary. Read the full license for all details.
         const char *short_manual =
 #include"short_manual.h"
         puts(short_manual);
+        exit(0);
     }
-    else
+
     if (config->daemon)
     {
         startDaemon(config->pid_file, config->device_override, config->listento_override);
         exit(0);
     }
-    else
+
     if (config->useconfig)
     {
         startUsingConfigFiles(config->config_root, false, config->device_override, config->listento_override);
@@ -492,6 +498,20 @@ void remove_lost_swradio_devices_from_ignore_list(vector<string> &devices)
     }
 }
 
+void check_statuses()
+{
+    LOCK("(main)", "check_statuses", devices_lock_);
+    vector<WMBus*> not_working;
+    for (auto &w : wmbus_devices_)
+    {
+        if (w->isWorking())
+        {
+            w->checkStatus();
+        }
+    }
+    UNLOCK("(main)", "check_statuses", devices_lock_);
+}
+
 void check_for_dead_wmbus_devices(Configuration *config)
 {
     trace("[MAIN] checking for dead wmbus devices...\n");
@@ -503,9 +523,9 @@ void check_for_dead_wmbus_devices(Configuration *config)
         if (!w->isWorking())
         {
             not_working.push_back(w.get());
-            if (!config->use_auto_detect)
+            if (config->use_auto_detect)
             {
-                notice("Lost %s closing %s\n", w->device().c_str(), toString(w->type()));
+                info("Lost %s closing %s\n", w->device().c_str(), toString(w->type()));
             }
         }
     }
@@ -529,7 +549,8 @@ void check_for_dead_wmbus_devices(Configuration *config)
     {
         if (!printed_warning_)
         {
-            info("(main) no wmbus device detected, waiting for a device to be plugged in.\n");
+            info("No wmbus device detected, waiting for a device to be plugged in.\n");
+            checkIfMultipleWmbusmetersRunning();
             printed_warning_ = true;
         }
     }
@@ -546,7 +567,7 @@ void open_wmbus_device(Configuration *config, string how, string device, Detecte
     // A newly plugged in device has been manually configured or automatically detected! Start using it!
     if (config->use_auto_detect)
     {
-        notice("Detected %s %s on %s\n", how.c_str(), toString(detected->type), device.c_str());
+        notice("Configure %s on %s\n", how.c_str(), toString(detected->type), device.c_str());
     }
     else
     {
@@ -562,6 +583,11 @@ void open_wmbus_device(Configuration *config, string how, string device, Detecte
     bool simulated = detected->type == WMBusDeviceType::DEVICE_SIMULATOR;
     wmbus->onTelegram([&, simulated](vector<uchar> data){return meter_manager_->handleTelegram(data, simulated);});
     wmbus->setTimeout(config->alarm_timeout, config->alarm_expected_activity);
+    if (detected->type == DEVICE_SIMULATOR)
+    {
+        debug("(main) added %s to files\n", detected->device.file.c_str());
+        simulation_files_.insert(detected->device.file);
+    }
     UNLOCK("(main)", "perform_auto_scan_of_devices", devices_lock_);
 }
 
@@ -593,11 +619,11 @@ void perform_auto_scan_of_serial_devices(Configuration *config)
                 // A modem, an android phone, a teletype Model 33, etc....
                 // Mark this serial device as unknown, to avoid repeated detection attempts.
                 not_serial_wmbus_devices_.insert(device);
-                info("(main) ignoring %s, it does not respond as any of the supported wmbus devices.\n", device.c_str());
+                verbose("(main) ignoring %s, it does not respond as any of the supported wmbus devices.\n", device.c_str());
             }
             else
             {
-                open_wmbus_device(config, "auto scan detected", device, &detected);
+                open_wmbus_device(config, "during auto scan", device, &detected);
             }
         }
     }
@@ -630,12 +656,12 @@ void perform_auto_scan_of_swradio_devices(Configuration *config)
             {
                 // We cannot access this swradio device.
                 not_swradio_wmbus_devices_.insert(device);
-                info("(main) ignoring swradio %s since it is unavailable.\n", device.c_str());
+                verbose("(main) ignoring swradio %s since it is unavailable.\n", device.c_str());
             }
             else
             {
                 detected.device.file = device;
-                open_wmbus_device(config, "auto scan detected", device, &detected);
+                open_wmbus_device(config, "during auto scan", device, &detected);
             }
         }
     }
@@ -659,7 +685,11 @@ void detectAndConfigureWMBusDevices(Configuration *config)
             trace("(main) %s already configured\n", sd->device().c_str());
             continue;
         }
-
+        if (simulation_files_.count(device.file) > 0)
+        {
+            debug("(main) %s already configured as simulation\n", device.file.c_str());
+            continue;
+        }
         if (do_not_open_file_again_.count(device.file) == 0)
         {
             Detected detected = detectWMBusDeviceSetting(device.file,
@@ -674,7 +704,7 @@ void detectAndConfigureWMBusDevices(Configuration *config)
                     // Only read stdin and files once!
                     do_not_open_file_again_.insert(device.file);
                 }
-                open_wmbus_device(config, "manual configuration", device.str(), &detected);
+                open_wmbus_device(config, "using manual setting", device.str(), &detected);
             }
         }
         else
@@ -745,6 +775,7 @@ bool start(Configuration *config)
     // If our software unexpectedly exits, then stop the manager, to try
     // to achive a nice shutdown.
     onExit(call(serial_manager_.get(),stop));
+    serial_manager_->eachEventLooping([]() { check_statuses(); });
 
     // Create the printer object that knows how to translate
     // telegrams into json, fields that are written into log files
@@ -778,10 +809,14 @@ bool start(Configuration *config)
 
     if (!config->use_auto_detect)
     {
-        serial_manager_->expectDevicesToWork();
+        if (simulation_files_.size() == 0)
+        {
+            serial_manager_->expectDevicesToWork();
+        }
         if (wmbus_devices_.size() == 0)
         {
-            notice("(main) no wmbus device configured! Exiting.\n");
+            notice("No wmbus device configured! Exiting.\n");
+            checkIfMultipleWmbusmetersRunning();
             serial_manager_->stop();
         }
     }
@@ -789,7 +824,8 @@ bool start(Configuration *config)
     {
         if (wmbus_devices_.size() == 0)
         {
-            notice("(main) no wmbus device detected, waiting for a device to be plugged in.\n");
+            notice("No wmbus device detected, waiting for a device to be plugged in.\n");
+            checkIfMultipleWmbusmetersRunning();
         }
     }
 
@@ -947,3 +983,29 @@ void startUsingConfigFiles(string root, bool is_daemon, string device_override,
     }
     while (restart);
 }
+
+
+void checkIfMultipleWmbusmetersRunning()
+{
+    pid_t my_pid = getpid();
+    vector<int> daemons;
+    detectProcesses("wmbusmetersd", &daemons);
+    for (int i : daemons)
+    {
+        if (i != my_pid)
+        {
+            info("Notice! Wmbusmeters daemon (pid %d) is running and it might hog any wmbus devices.\n", i);
+        }
+    }
+
+    vector<int> processes;
+    detectProcesses("wmbusmeters", &processes);
+
+    for (int i : processes)
+    {
+        if (i != my_pid)
+        {
+            info("Notice! Other wmbusmeters (pid %d) is running and it might hog any wmbus devices.\n", i);
+        }
+    }
+}
diff --git a/src/serial.cc b/src/serial.cc
index 9ece822..dd78681 100644
--- a/src/serial.cc
+++ b/src/serial.cc
@@ -77,6 +77,8 @@ struct SerialCommunicationManagerImp : public SerialCommunicationManager
 
     void listenTo(SerialDevice *sd, function<void()> cb);
     void onDisappear(SerialDevice *sd, function<void()> cb);
+    void eachEventLooping(function<void()> cb);
+
     void expectDevicesToWork();
     void stop();
     void startEventLoop();
@@ -121,17 +123,18 @@ private:
     pthread_mutex_t devices_lock_ = PTHREAD_MUTEX_INITIALIZER;
     vector<SerialDeviceImp*> devices_;
     vector<Timer> timers_;
-    pthread_mutex_t timers_lock_ = PTHREAD_MUTEX_INITIALIZER;
+//    pthread_mutex_t timers_lock_ = PTHREAD_MUTEX_INITIALIZER;
     bool calling_timers_ {};
-    pthread_mutex_t timer_thread_lock_ = PTHREAD_MUTEX_INITIALIZER;
+    pthread_mutex_t timer_thread_lock_ = PTHREAD_MUTEX_INITIALIZER; // Only have one regular callback thread running.
+    function<void()> on_event_looping_;
 };
 
 SerialCommunicationManagerImp::~SerialCommunicationManagerImp()
 {
+    // Stop the loop.
+    stop();
     // Close all managed devices (not yet closed)
     closeAll();
-    // Stop the event loop.
-    stop();
     // Grab the event_loop_lock. This can only be done when the eventLoop has stopped running.
     LOCK("(serial)", "destructor", event_loop_lock_);
     // Now we can be sure the eventLoop has stopped and it is safe to
@@ -723,6 +726,11 @@ void SerialCommunicationManagerImp::onDisappear(SerialDevice *sd, function<void(
     si->on_disappear_ = cb;
 }
 
+void SerialCommunicationManagerImp::eachEventLooping(function<void()> cb)
+{
+    on_event_looping_ = cb;
+}
+
 void SerialCommunicationManagerImp::expectDevicesToWork()
 {
     debug("(serial) expecting devices to work\n");
@@ -770,14 +778,15 @@ void SerialCommunicationManagerImp::waitForStop()
         }
         usleep(1000*1000);
     }
+    debug("(serial) closing %d devices\n", devices_.size());
+    closeAll();
+
     if (signalsInstalled())
     {
         if (select_thread_) pthread_kill(select_thread_, SIGUSR1);
     }
     pthread_join(select_thread_, NULL);
 
-    debug("(serial) closing %d devices\n", devices_.size());
-    closeAll();
 }
 
 bool SerialCommunicationManagerImp::isRunning()
@@ -848,19 +857,28 @@ void SerialCommunicationManagerImp::closeAll()
 void SerialCommunicationManagerImp::executeTimerCallbacks()
 {
     time_t curr = time(NULL);
-    LOCK("(serial)", "executeTimerCallbacks", timers_lock_);
-    vector<Timer> timers_copy = timers_;
-    UNLOCK("(serial)", "executeTimerCallbacks", timers_lock_);
+    vector<Timer> to_be_called;
 
-    for (Timer &t : timers_copy)
+    LOCK("(serial)", "executeTimerCallbacks", devices_lock_);
+
+    for (Timer &t : timers_)
     {
         if (t.isTime(curr))
         {
-            trace("[SERIAL] invoking callback %d %s\n", t.id, t.name.c_str());
+            trace("[SERIAL] timer isTime! %d %s\n", t.id, t.name.c_str());
             t.last_call = curr;
-            t.callback();
+            to_be_called.push_back(t);
         }
     }
+
+    UNLOCK("(serial)", "executeTimerCallbacks", devices_lock_);
+
+    for (Timer &t : to_be_called)
+    {
+        trace("[SERIAL] invoking callback %s(%d)\n", t.name.c_str(), t.id);
+        t.callback();
+    }
+
 }
 
 time_t SerialCommunicationManagerImp::calculateTimeToNearestTimerCallback(time_t now)
@@ -1006,10 +1024,13 @@ void *SerialCommunicationManagerImp::eventLoop()
             }
             else
             {
-                debug("(serial) not starting timer thread since it is already running.\n");
+                trace("(serial) not starting timer thread since it is already running.\n");
             }
         }
 
+        // Invoke callback every event looping....
+        if (on_event_looping_) on_event_looping_();
+
         if (non_working.size() > 0 && expect_devices_to_work_ && resetting_ == false)
         {
             debug("(serial) non working devices found, exiting.\n");
@@ -1121,17 +1142,17 @@ SerialCommunicationManager::~SerialCommunicationManager()
 int SerialCommunicationManagerImp::startRegularCallback(string name, int seconds, function<void()> callback)
 {
     Timer t = { (int)timers_.size(), seconds, time(NULL), callback, name };
-    LOCK("(serial)", "startRegularCallback", timers_lock_);
+    LOCK("(serial)", "startRegularCallback", devices_lock_);
     timers_.push_back(t);
-    UNLOCK("(serial)", "startRegularCallback", timers_lock_);
-    debug("(serial) registered regular callback %d %s every %d seconds\n", t.id, name.c_str(), seconds);
+    UNLOCK("(serial)", "startRegularCallback", devices_lock_);
+    debug("(serial) registered regular callback %s(%d) every %d seconds\n", name.c_str(), t.id, seconds);
     return t.id;
 }
 
 void SerialCommunicationManagerImp::stopRegularCallback(int id)
 {
     debug("(serial) stopping regular callback %d\n", id);
-    LOCK("(serial)", "stopRegularCallback", timers_lock_);
+    LOCK("(serial)", "stopRegularCallback", devices_lock_);
     for (auto i = timers_.begin(); i != timers_.end(); ++i)
     {
         if ((*i).id == id)
@@ -1140,7 +1161,7 @@ void SerialCommunicationManagerImp::stopRegularCallback(int id)
             break;
         }
     }
-    UNLOCK("(serial)", "startRegularCallback", timers_lock_);
+    UNLOCK("(serial)", "stopRegularCallback", devices_lock_);
 }
 
 
diff --git a/src/serial.h b/src/serial.h
index 6566baa..706d923 100644
--- a/src/serial.h
+++ b/src/serial.h
@@ -79,6 +79,8 @@ struct SerialCommunicationManager
     virtual void listenTo(SerialDevice *sd, function<void()> cb) = 0;
     // Invoke cb callback when the serial device has disappeared!
     virtual void onDisappear(SerialDevice *sd, function<void()> cb) = 0;
+    // Invoke once every select loop, typically once per second.
+    virtual void eachEventLooping(function<void()> cb) = 0;
     // Normally the communication mananager runs for ever.
     // But if you expect configured devices to work, then
     // the manager will exit when there are no working devices.
diff --git a/src/shell.cc b/src/shell.cc
index 2776629..c951d6d 100644
--- a/src/shell.cc
+++ b/src/shell.cc
@@ -325,3 +325,22 @@ bool invokeShellCaptureOutput(string program, vector<string> args, vector<string
 
     return true;
 }
+
+void detectProcesses(string cmd, vector<int> *pids)
+{
+    vector<string> args;
+    vector<string> envs;
+    args.push_back(cmd);
+    string out;
+    invokeShellCaptureOutput("/bin/pidof", args, envs, &out, true);
+
+    char buf[out.size()+1];
+    strcpy(buf, out.c_str());
+    char *pch;
+    pch = strtok (buf," \n");
+    while (pch != NULL)
+    {
+        pids->push_back(atoi(pch));
+        pch = strtok (NULL, " \n");
+    }
+}
diff --git a/src/shell.h b/src/shell.h
index 887045d..e995c16 100644
--- a/src/shell.h
+++ b/src/shell.h
@@ -25,3 +25,4 @@ bool invokeShellCaptureOutput(string program, vector<string> args, vector<string
 bool invokeBackgroundShell(string program, vector<string> args, vector<string> envs, int *out, int *pid);
 bool stillRunning(int pid);
 void stopBackgroundShell(int pid);
+void detectProcesses(string cmd, vector<int> *pids);
diff --git a/src/testinternals.cc b/src/testinternals.cc
index a9b6c87..4808363 100644
--- a/src/testinternals.cc
+++ b/src/testinternals.cc
@@ -333,6 +333,7 @@ int test_linkmodes()
     }
     debug("test7 OK\n\n");
 
+    manager->stop();
     return 0;
 }
 
diff --git a/src/timings.h b/src/timings.h
index 86a4f51..eb9a5bf 100644
--- a/src/timings.h
+++ b/src/timings.h
@@ -21,9 +21,7 @@
 // Default select timeout one second.
 #define SELECT_TIMEOUT 1
 
-// Default checkStatus callback frequency every 60 seconds, when an alarmtimeout has been set.
-#define CHECKSTATUS_TIMER 60
-// When running internal tests on timeouts use 2 seconds instead.
-#define CHECKSTATUS_TIMER_INTERNAL_TESTING 2
+// Default checkStatus callback frequency every 2 seconds, when an alarmtimeout has been set.
+#define CHECKSTATUS_TIMER 2
 
 #endif
diff --git a/src/wmbus.cc b/src/wmbus.cc
index 603be2c..deee513 100644
--- a/src/wmbus.cc
+++ b/src/wmbus.cc
@@ -3262,7 +3262,6 @@ bool Telegram::findFormatBytesFromKnownMeterSignatures(vector<uchar> *format_byt
 
 WMBusCommonImplementation::~WMBusCommonImplementation()
 {
-    manager_->stopRegularCallback(regular_cb_id_);
     debug("(wmbus) deleted %s\n", toString(type()));
 }
 
@@ -3277,12 +3276,14 @@ WMBusCommonImplementation::WMBusCommonImplementation(WMBusDeviceType t,
     // Initialize timeout from now.
     last_received_ = time(NULL);
 
+    /*
     // Invoke the check status once per minute. Unless internal testing, then it is every 2 seconds.
-    int default_timer = isInternalTestingEnabled() ? CHECKSTATUS_TIMER_INTERNAL_TESTING : CHECKSTATUS_TIMER;
+    int default_timer = CHECKSTATUS_TIMER;
     string info = "simulator";
     if (serial != NULL) info = serial_->device();
     string alarm_id = "CHECK_STATUS "+string(toString(t))+":"+info;
     regular_cb_id_ = manager_->startRegularCallback(alarm_id, default_timer, call(this,checkStatus));
+    */
 }
 
 WMBusDeviceType WMBusCommonImplementation::type()
@@ -3394,6 +3395,7 @@ bool WMBusCommonImplementation::isWorking()
 
 void WMBusCommonImplementation::checkStatus()
 {
+    trace("[ALARM] check status\n");
     if (protocol_error_count_ >= 20)
     {
         string msg;
@@ -3416,58 +3418,73 @@ void WMBusCommonImplementation::checkStatus()
     time_t now = time(NULL);
     time_t then = now - timeout_;
     time_t since = now-last_received_;
-    if (timeout_ > 0 && since < timeout_)
+
+    // If no timeout set, just return.
+    if (timeout_ == 0) return;
+
+    if (since < timeout_)
     {
-        trace("[WMBUS] No timeout. All ok. (%d s) Now %d seconds since last telegram was received.\n", since);
+        trace("[WMBUS] No timeout since=%d timeout=%d. All ok.\n", since, timeout_);
         return;
     }
 
+    last_received_ = time(NULL);
+
     // The timeout has expired! But is the timeout expected because there should be no activity now?
     // Also, do not sound the alarm unless we actually have a possible timeout within the expected activity,
     // otherwise we will always get an alarm when we enter the expected activity period.
-    if (isInsideTimePeriod(now, expected_activity_) &&
-        isInsideTimePeriod(then, expected_activity_))
+    if (!(isInsideTimePeriod(now, expected_activity_) &&
+          isInsideTimePeriod(then, expected_activity_)))
     {
+        trace("[WMBUS] hit timeout(%d s) but this is ok, since there is no expected activity.\n", timeout_);
+        return;
+    }
 
-        time_t nowt = time(NULL);
-        struct tm nowtm;
-        localtime_r(&nowt, &nowtm);
+    // Ok, timeout has triggered for real! Deal with it!
+    struct tm nowtm;
+    localtime_r(&now, &nowtm);
 
-        string now = strdatetime(&nowtm);
+    string nowtxt = strdatetime(&nowtm);
 
-        string msg;
-        strprintf(msg, "%d seconds of inactivity resetting %s %s "
-                  "(timeout %ds expected %s now %s)",
-                  since, device().c_str(), toString(type()),
-                  timeout_, expected_activity_.c_str(), now.c_str());
+    string msg;
+    strprintf(msg, "%d seconds of inactivity resetting %s %s "
+              "(timeout %ds expected %s now %s)",
+              since, device().c_str(), toString(type()),
+              timeout_, expected_activity_.c_str(), nowtxt.c_str());
 
-        logAlarm("inactivity", msg);
+    logAlarm("inactivity", msg);
 
-        bool ok = reset();
-        if (ok)
-        {
-            warning("(wmbus) successfully reset wmbus device\n");
-        }
-        else
-        {
-            strprintf(msg, "failed to reset wmbus device %s %s exiting wmbusmeters", device().c_str(), toString(type()));
-            logAlarm("device_failure", msg);
-            manager_->stop();
-        }
+    bool ok = reset();
+    if (ok)
+    {
+        warning("(wmbus) successfully reset wmbus device\n");
     }
     else
     {
-        debug("(wmbus) Hit timeout(%d s) but no expected activity!\n", timeout_);
+        strprintf(msg, "failed to reset wmbus device %s %s exiting wmbusmeters", device().c_str(), toString(type()));
+        logAlarm("device_failure", msg);
+        manager_->stop();
     }
-    // Fake last received to restart the timeout.
-    last_received_ = time(NULL);
 }
 
 void WMBusCommonImplementation::setTimeout(int seconds, string expected_activity)
 {
+    assert(seconds >= 0);
+
     timeout_ = seconds;
+    if (expected_activity == "")
+    {
+        expected_activity = "mon-sun(00-23)";
+    }
     expected_activity_ = expected_activity;
-    debug("(wmbus) set timeout %s to \"%d\" with expected activity \"%s\"\n", toString(type_), timeout_, expected_activity_.c_str());
+    if (seconds > 0)
+    {
+        debug("(wmbus) set timeout %s to \"%d\" with expected activity \"%s\"\n", toString(type_), timeout_, expected_activity_.c_str());
+    }
+    else
+    {
+        debug("(wmbus) no alarm (expected activity) for %s\n", toString(type_));
+    }
 }
 
 int toInt(TPLSecurityMode tsm)
diff --git a/src/wmbus_im871a.cc b/src/wmbus_im871a.cc
index e5ae8cf..bf4dabb 100644
--- a/src/wmbus_im871a.cc
+++ b/src/wmbus_im871a.cc
@@ -61,7 +61,9 @@ struct WMBusIM871A : public virtual WMBusCommonImplementation
     void simulate() { }
 
     WMBusIM871A(unique_ptr<SerialDevice> serial, SerialCommunicationManager *manager);
-    ~WMBusIM871A() { }
+    ~WMBusIM871A() {
+        manager_->onDisappear(this->serial(), NULL);
+    }
 
 private:
 
diff --git a/src/wmbus_rtlwmbus.cc b/src/wmbus_rtlwmbus.cc
index 642c162..ba077cb 100644
--- a/src/wmbus_rtlwmbus.cc
+++ b/src/wmbus_rtlwmbus.cc
@@ -56,6 +56,11 @@ struct WMBusRTLWMBUS : public virtual WMBusCommonImplementation
     void simulate();
 
     WMBusRTLWMBUS(unique_ptr<SerialDevice> serial, SerialCommunicationManager *manager);
+    ~WMBusRTLWMBUS()
+    {
+        manager_->listenTo(this->serial(), NULL);
+        manager_->onDisappear(this->serial(), NULL);
+    }
 
 private:
 
diff --git a/src/wmbus_simulator.cc b/src/wmbus_simulator.cc
index 6cc3a8d..baa0cad 100644
--- a/src/wmbus_simulator.cc
+++ b/src/wmbus_simulator.cc
@@ -177,7 +177,11 @@ void WMBusSimulator::simulate()
                         curr = time(NULL);
                         if (curr > start_time + rel_time) break;
                         usleep(1000*1000);
-                        if (!manager_->isRunning()) break;
+                        if (!manager_->isRunning())
+                        {
+                            debug("(simulator) exiting early\n");
+                            break;
+                        }
                     }
                 }
             }
diff --git a/src/wmbus_utils.h b/src/wmbus_utils.h
index a1cc652..a71a9bb 100644
--- a/src/wmbus_utils.h
+++ b/src/wmbus_utils.h
@@ -70,8 +70,6 @@ struct WMBusCommonImplementation : public virtual WMBus
     bool link_modes_configured_ {};
     LinkModeSet link_modes_ {};
 
-    int regular_cb_id_;
-
     unique_ptr<SerialDevice> serial_;
 };
 
diff --git a/test.sh b/test.sh
index 021c89a..e7498dc 100755
--- a/test.sh
+++ b/test.sh
@@ -78,11 +78,10 @@ if [ "$?" != "0" ]; then RC="1"; fi
 tests/test_serial_bads.sh $PROG
 if [ "$?" != "0" ]; then RC="1"; fi
 
-#if [ "$(uname)" = "Linux" ]
-#then
-#    tests/test_alarm.sh $PROG
-#    if [ "$?" != "0" ]; then RC="1"; fi
-
-#fi
+if [ "$(uname)" = "Linux" ]
+then
+    tests/test_alarm.sh $PROG
+    if [ "$?" != "0" ]; then RC="1"; fi
+fi
 
 exit $RC
diff --git a/tests/config7/etc/wmbusmeters.conf b/tests/config7/etc/wmbusmeters.conf
index 8e149de..51025e3 100644
--- a/tests/config7/etc/wmbusmeters.conf
+++ b/tests/config7/etc/wmbusmeters.conf
@@ -1,4 +1,4 @@
-loglevel=debug
+loglevel=normal
 # Set internaltesting=true to shorten times for test to finish in reasonable time.
 internaltesting=true
 device=must_be_overriden
@@ -9,7 +9,7 @@ shell=echo METER =="$METER_JSON"==  >> /tmp/wmbusmeters_telegram_test
 # The alarm will always be logged in the log file.
 alarmshell=echo ALARM_SHELL "$ALARM_TYPE" "$ALARM_MESSAGE" >> /tmp/wmbusmeters_alarm_test
 # Expect a received telegram no longer than 1 second since the last telegram!
-alarmtimeout=1s
+alarmtimeout=4s
 # Only sound the alarm if the timeout is reached when the radio is actually
 # expected to be transmitting. Some meters disable transmissions during nights
 # and weekends. Change this to mon-fri(08-19)
diff --git a/tests/test_alarm.sh b/tests/test_alarm.sh
index 6cc8017..52bc6a9 100755
--- a/tests/test_alarm.sh
+++ b/tests/test_alarm.sh
@@ -12,10 +12,10 @@ echo "RUNNING $TESTNAME ..."
 > /tmp/wmbusmeters_telegram_test
 > /tmp/wmbusmeters_alarm_test
 
-$PROG --useconfig=tests/config7 --device=simulations/simulation_alarm.txt | sed 's/....-..-.. ..:../1111-11-11 11:11/' > $TEST/test_output.txt
+$PROG --useconfig=tests/config7 --device=simulations/simulation_alarm.txt 2> $TEST/test_stderr.txt | sed 's/....-..-..T..:..:..Z/1111-11-11T11:11:11Z/' > $TEST/test_output.txt
 
 cat > $TEST/test_expected.txt <<EOF
-(alarm) inactivity: 2 seconds of inactivity resetting simulations/simulation_alarm.txt DEVICE_SIMULATOR (timeout 1s expected mon-sun(00-23) now 1111-11-11 11:11)
+(alarm) inactivity: 4 seconds of inactivity resetting simulations/simulation_alarm.txt DEVICE_SIMULATOR (timeout 4s expected mon-sun(00-23) now 1111-11-11 11:11)
 (wmbus) successfully reset wmbus device
 EOF
 
@@ -25,16 +25,18 @@ METER =={"media":"cold water","meter":"multical21","name":"Water","id":"76348799
 EOF
 
 cat > /tmp/wmbusmeters_alarm_expected <<EOF
-ALARM_SHELL inactivity 2 seconds of inactivity resetting simulations/simulation_alarm.txt DEVICE_SIMULATOR (timeout 1s expected mon-sun(00-23) now 1111-11-11 11:11)
+ALARM_SHELL inactivity 4 seconds of inactivity resetting simulations/simulation_alarm.txt DEVICE_SIMULATOR (timeout 4s expected mon-sun(00-23) now 1111-11-11 11:11)
 EOF
 
-REST=$(diff $TEST/test_output.txt $TEST/test_expected.txt)
+cat $TEST/test_stderr.txt | sed 's/now ....-..-.. ..:../now 1111-11-11 11:11/' > $TEST/test_responses.txt
+
+REST=$(diff $TEST/test_responses.txt $TEST/test_expected.txt)
 
 if [ ! -z "$REST" ]
 then
-    echo ERROR STDOUT: $TESTNAME
+    echo ERROR STDERR: $TESTNAME
     echo -----------------
-    diff $TEST/test_output.txt $TEST/test_expected.txt
+    diff $TEST/test_responses.txt $TEST/test_expected.txt
     echo -----------------
     TESTRESULT="ERROR"
 fi