hbc proper termination, hbd config reloadable

.hb.yaml

@@ -248,7 +248,7 @@ threshold_configs:
           critical: 2
           operator: ">="
       rtt:
-        warning: 50
+        warning: 100
         critical: 250.0
 
 

docs/CONFIG_RELOAD.md

@@ -0,0 +1,292 @@
+# Configuration Reload
+
+The heartbeat daemon (hbd) supports runtime configuration reloading without requiring a full restart. This allows you to update certain configuration settings while the service continues running.
+
+## How to Reload Configuration
+
+Send a SIGHUP signal to the running hbd process:
+
+```bash
+# Find the process ID
+ps aux | grep hbd
+
+# Or use pidof/pgrep
+pidof hbd
+pgrep -f hbd
+
+# Send SIGHUP signal
+kill -HUP <pid>
+
+# Or if using systemd
+systemctl reload heartbeat
+```
+
+## What Can Be Reloaded
+
+The following configuration sections can be reloaded without restarting:
+
+### ✅ Fully Reloadable
+
+- **Notification Channels** (`notification_channels`)
+  - Add, remove, or modify notification channel definitions
+  - Update tokens, API keys, SMTP credentials
+  - Change recipient lists
+
+- **Threshold Configurations** (`threshold_configs`)
+  - Modify warning and critical thresholds
+  - Add or remove threshold rules
+  - Change operators and hysteresis values
+  - Update display formats
+
+- **Host Configuration** (`hosts`)
+  - Change watch status
+  - Update notification channel assignments
+  - Modify threshold config assignments
+  - Change dyndns status
+
+- **Host Lists**
+  - `watchhosts` - hosts to monitor
+  - `dyndnshosts` - hosts with dynamic DNS
+  - `drophosts` - hosts to ignore
+
+- **Runtime Settings**
+  - `grace` - grace period multiplier
+  - `interval` - expected heartbeat interval
+  - `threshold_renotify_interval` - re-notification interval
+  - `debug` - debug level
+  - `verbose` - verbose output
+
+- **DNS Settings**
+  - `dyndomains` - dynamic DNS domains
+  - `nsupdate_bin` - nsupdate binary path
+  - `rndc_key` - RNDC key path
+
+### ⚠️ Requires Restart
+
+The following settings **cannot** be reloaded and require a service restart:
+
+- **Network Ports**
+  - `hb_port` - UDP heartbeat port
+  - `hbd_port` - HTTP API port
+  - `ws_port` - WebSocket port
+  - `wss_port` - Secure WebSocket port
+
+- **SSL/TLS Settings**
+  - `cert_path` - SSL certificate path
+  - `wss_pem` - SSL certificate file
+  - `wss_key` - SSL key file
+
+- **Persistence**
+  - `pickfile` - Pickle file path
+
+- **Logging**
+  - `logfile` - Log file path
+  - `logfmt` - Log format
+
+- **Journal Settings**
+  - `journal_enabled` - Enable/disable journaling
+  - `journal_dir` - Journal directory
+  - `journal_file` - Journal filename
+  - `journal_max_size` - Maximum journal size
+  - `journal_max_backups` - Number of backup files
+
+## Reload Process
+
+When a SIGHUP signal is received:
+
+1. **Configuration File Loading**
+   - The config file is re-read from disk
+   - YAML parsing is performed
+   - Validation checks are run
+
+2. **Component Updates**
+   - Notification system is updated with new channel definitions
+   - Threshold checker reloads all threshold configurations
+   - Alert states are preserved to maintain hysteresis
+
+3. **Error Handling**
+   - If reload fails, the previous configuration is kept
+   - Error messages are logged
+   - Service continues running with old configuration
+
+4. **Logging**
+   - Reload start and completion are logged
+   - Each component reports its reload status
+   - Total number of thresholds is reported
+
+## Example Reload Session
+
+```bash
+# Terminal 1: Watch the logs
+tail -f /var/log/heartbeat.log
+
+# Terminal 2: Edit configuration
+vim /path/to/.hb.yaml
+
+# Make changes to notification channels or thresholds
+# Save the file
+
+# Terminal 3: Trigger reload
+kill -HUP $(pgrep -f hbd)
+
+# Terminal 1: See reload messages
+2026-04-01 12:34:56 INFO: Received SIGHUP, initiating config reload...
+2026-04-01 12:34:56 INFO: ============================================================
+2026-04-01 12:34:56 INFO: Starting configuration reload...
+2026-04-01 12:34:56 INFO: ============================================================
+2026-04-01 12:34:56 INFO: Configuration reloaded from /path/to/.hb.yaml
+2026-04-01 12:34:56 INFO: Notification configuration reloaded
+2026-04-01 12:34:56 INFO: Reloading threshold configuration...
+2026-04-01 12:34:56 INFO: Threshold configuration reloaded: 42 total thresholds
+2026-04-01 12:34:56 INFO: ============================================================
+2026-04-01 12:34:56 INFO: Configuration reload completed successfully
+2026-04-01 12:34:56 INFO: ============================================================
+```
+
+## Common Use Cases
+
+### 1. Update Notification Credentials
+
+If you need to rotate API keys or update SMTP passwords:
+
+```yaml
+notification_channels:
+  pushover_standard:
+    type: pushover
+    token: new-token-here    # Updated
+    user: new-user-key-here  # Updated
+```
+
+Just edit the config file and send SIGHUP - no restart needed.
+
+### 2. Adjust Threshold Values
+
+Fine-tune alerting thresholds based on observed behavior:
+
+```yaml
+threshold_configs:
+  default:
+    thresholds:
+      cpu_monitor:
+        cpu_percent:
+          warning: 85.0   # Increased from 80.0
+          critical: 95.0  # Increased from 90.0
+```
+
+Send SIGHUP to apply the new thresholds immediately.
+
+### 3. Add New Notification Channels
+
+Add a new notification destination:
+
+```yaml
+notification_channels:
+  email_oncall:
+    type: email
+    recipients: [oncall@example.com]
+    sender: alerts@example.com
+    smtp_server: smtp.example.com
+
+hosts:
+  critical_server:
+    threshold_config: default
+    watch: true
+    notification_channels: [pushover_standard, email_oncall]  # Added
+```
+
+The new channel becomes active immediately after SIGHUP.
+
+### 4. Update Watch List
+
+Start or stop monitoring hosts without restart:
+
+```yaml
+hosts:
+  new_server:
+    threshold_config: default
+    watch: true           # Start watching
+    notification_channels: [pushover_standard]
+```
+
+## Best Practices
+
+1. **Test Configuration Before Reload**
+   - Validate YAML syntax before sending SIGHUP
+   - Check for typos in channel names
+   - Verify threshold values are reasonable
+
+2. **Monitor Reload Logs**
+   - Always check logs after reload to confirm success
+   - Look for error messages if reload fails
+   - Verify expected number of thresholds loaded
+
+3. **Backup Before Changes**
+   - Keep a backup of working configuration
+   - Use version control (git) for config files
+   - Document why changes were made
+
+4. **Gradual Rollout**
+   - Test changes on development server first
+   - Apply to one production server at a time
+   - Verify behavior before applying everywhere
+
+5. **Plan for Restart-Required Changes**
+   - Schedule downtime for port or SSL changes
+   - Use blue-green deployment if possible
+   - Keep service downtime minimal
+
+## Troubleshooting
+
+### Reload Doesn't Apply Changes
+
+**Check:**
+- Is the config file path correct?
+- Did you save the file after editing?
+- Are there YAML syntax errors?
+- Check the logs for error messages
+
+**Solution:**
+```bash
+# Validate YAML syntax
+python -c "import yaml; yaml.safe_load(open('.hb.yaml'))"
+
+# Check file modification time
+ls -l .hb.yaml
+
+# View logs
+journalctl -u heartbeat -f
+```
+
+### Partial Configuration Applied
+
+**Cause:** Some sections reloaded, others didn't.
+
+**Solution:** Check logs to see which components failed. Common issues:
+- Invalid channel type
+- Missing required threshold fields
+- Invalid host references
+
+### Service Becomes Unresponsive
+
+**Cause:** Malformed configuration caused an exception.
+
+**Solution:**
+1. Revert to backup configuration
+2. Send SIGHUP again to reload the good config
+3. If service is completely stuck, restart it
+
+## Implementation Details
+
+The reload mechanism uses:
+
+- **Signal Handling**: SIGHUP triggers reload event
+- **Async-Safe Reloading**: Configuration is loaded asynchronously
+- **Component Coordination**: All affected components are updated atomically
+- **State Preservation**: Alert states and hysteresis information are maintained
+- **Error Recovery**: Failed reloads don't affect running configuration
+
+## See Also
+
+- [NOTIFICATIONS.md](NOTIFICATIONS.md) - Notification channel configuration
+- [THRESHOLD_ALERTING.md](THRESHOLD_ALERTING.md) - Threshold configuration details
+- Configuration examples in `hbd/config_*.yaml`

docs/HTTP_API.md

@@ -28,7 +28,6 @@ Get list of all monitored hosts with their state information.
   {
     "name": "webserver01",
     "dyn": false,
-    "ver": 6,
     "connections": [...]
   }
 ]

docs/MESSAGE_JOURNAL.md

@@ -48,7 +48,7 @@ journal_max_backups: 10                        # Number of backup files to keep
 Messages are logged in JSONL (JSON Lines) format - one JSON object per line:
 
 ```json
-{"timestamp":1711234567.123,"datetime":"2026-03-28T12:34:56","source_ip":"192.168.1.100","source_port":50003,"message":{"ID":"HTB","name":"webserver1","interval":30,"ver":1}}
+{"timestamp":1711234567.123,"datetime":"2026-03-28T12:34:56","source_ip":"192.168.1.100","source_port":50003,"message":{"ID":"HTB","name":"webserver1","interval":30}}
 {"timestamp":1711234597.456,"datetime":"2026-03-28T12:35:37","source_ip":"192.168.1.101","source_port":50003,"message":{"ID":"PLG","plugin":"cpu_monitor","cpu_percent":45.2,"load_1min":1.5}}
 ```
 

hbd/client/main.py

@@ -28,12 +28,13 @@ from .plugin import PluginRegistry, PluginLoader, InfoPlugin, MonitorPlugin
 # Constants
 PORT = 50003
 INTERVAL = 10
-VER = 6
 MAXRECV = 32767
 
 # Global state
 running = True
 dorestart = False
+shutdown_event: Optional[asyncio.Event] = None
+active_tasks: List[asyncio.Task] = []
 
 
 class AsyncConnection:
@@ -101,7 +102,6 @@ class AsyncConnection:
         # Add standard fields
         msg["name"] = shortname(self.name)
         msg["id"] = self.conn_id
-        msg["ver"] = VER
         msg["time"] = time.time()
         
         # Encode message
@@ -278,9 +278,25 @@ async def heartbeat_sender(conn: AsyncConnection, interval: int):
             
         except Exception as e:
             logger.error(f"Error sending heartbeat: {e}", exc_info=True)
+        except asyncio.CancelledError:
+            logger.debug("Heartbeat sender cancelled")
+            raise
         
-        # Wait for next interval
-        await asyncio.sleep(interval)
+        # Wait for next interval or shutdown event
+        try:
+            if shutdown_event:
+                await asyncio.wait_for(
+                    shutdown_event.wait(), 
+                    timeout=interval
+                )
+                break
+            else:
+                await asyncio.sleep(interval)
+        except asyncio.TimeoutError:
+            pass  # Normal timeout, continue loop
+        except asyncio.CancelledError:
+            logger.debug("Heartbeat sender cancelled during sleep")
+            raise
 
 
 async def plugin_collector(conn: AsyncConnection, registry: PluginRegistry):
@@ -324,7 +340,14 @@ async def plugin_collector(conn: AsyncConnection, registry: PluginRegistry):
     
     # Wait for all tasks
     if tasks:
-        await asyncio.gather(*tasks)
+        try:
+            await asyncio.gather(*tasks, return_exceptions=True)
+        except asyncio.CancelledError:
+            logger.debug("Plugin collector cancelled, cancelling sub-tasks")
+            for task in tasks:
+                if not task.done():
+                    task.cancel()
+            raise
 
 
 async def plugin_collector_interval(
@@ -350,13 +373,30 @@ async def plugin_collector_interval(
                     plugin_msg = {"plugin": plugin.name, **data}
                     await conn.sendto(plugin_msg, "PLG")
                     logger.debug(f"Sent {plugin.name} data")
+            except asyncio.CancelledError:
+                logger.debug("Plugin collector cancelled")
+                raise
             except Exception as e:
                 logger.error(
                     f"Error collecting {plugin.name}: {e}",
                     exc_info=True
                 )
         
-        await asyncio.sleep(interval)
+        # Wait for next interval or shutdown event
+        try:
+            if shutdown_event:
+                await asyncio.wait_for(
+                    shutdown_event.wait(),
+                    timeout=interval
+                )
+                break
+            else:
+                await asyncio.sleep(interval)
+        except asyncio.TimeoutError:
+            pass  # Normal timeout, continue loop
+        except asyncio.CancelledError:
+            logger.debug("Plugin collector cancelled during sleep")
+            raise
 
 
 def shortname(name: str) -> str:
@@ -368,6 +408,15 @@ def stop():
     """Stop the event loop."""
     global running
     running = False
+    
+    # Set shutdown event to wake up sleeping tasks
+    if shutdown_event:
+        shutdown_event.set()
+    
+    # Cancel all active tasks
+    for task in active_tasks:
+        if not task.done():
+            task.cancel()
 
 
 async def cleanup(connections: List[AsyncConnection]):
@@ -393,7 +442,11 @@ async def cleanup(connections: List[AsyncConnection]):
 
 async def async_main(args, config):
     """Async main function."""
-    global running
+    global running, shutdown_event, active_tasks
+    
+    # Create shutdown event
+    shutdown_event = asyncio.Event()
+    active_tasks = []
     
     logger = logging.getLogger("hbc.main")
     
@@ -464,31 +517,30 @@ async def async_main(args, config):
     else:
         logger.warning(f"Plugin directory not found: {plugin_dir}")
     
-    # Start async tasks
-    tasks = []
-    
-    # Heartbeat senders (one per connection)
-    for conn in connections:
-        task = asyncio.create_task(heartbeat_sender(conn, interval))
-        tasks.append(task)
-    
-    # Plugin collector (uses all connections, but we'll use first one)
-    if connections and registry.get_enabled():
-        task = asyncio.create_task(plugin_collector(connections[0], registry))
-        tasks.append(task)
-    
     # Setup signal handlers
     loop = asyncio.get_event_loop()
     for sig in (signal.SIGTERM, signal.SIGINT):
         loop.add_signal_handler(sig, stop)
     
+    # Start async tasks
+    # Heartbeat senders (one per connection)
+    for conn in connections:
+        task = asyncio.create_task(heartbeat_sender(conn, interval))
+        active_tasks.append(task)
+    
+    # Plugin collector (uses all connections, but we'll use first one)
+    if connections and registry.get_enabled():
+        task = asyncio.create_task(plugin_collector(connections[0], registry))
+        active_tasks.append(task)
+    
     # Wait for stop or tasks to complete
     try:
-        await asyncio.gather(*tasks)
+        await asyncio.gather(*active_tasks, return_exceptions=True)
     except asyncio.CancelledError:
-        pass
+        logger.info("Tasks cancelled")
     
     # Cleanup
+    logger.info("Shutting down...")
     await cleanup(connections)
     await loader.unload_all()
     

hbd/server/cli.py

@@ -46,7 +46,8 @@ def main(argv=None):
     if args.debug > 0:
         config["debug"] = args.debug
 
-    run_server(config)
+    # Pass config_path for reloading support
+    run_server(config, config_path=args.configfile)
 
 
 if __name__ == "__main__":

hbd/server/config.py

@@ -1,5 +1,6 @@
 """Configuration loader and defaults for hbd (HeartBeat Daemon/Server)."""
 
+import asyncio
 import logging
 import os
 
@@ -95,6 +96,91 @@ def load_config(path=None):
     return cfg
 
 
+class ReloadableConfig:
+    """Thread-safe/async-safe configuration wrapper that supports runtime reloading.
+    
+    This class wraps the configuration dictionary and provides:
+    - Thread-safe config reloading via SIGHUP
+    - Backward-compatible dict-like access
+    - Async lock to prevent concurrent reloads
+    """
+    
+    def __init__(self, initial_config, config_path=None):
+        """Initialize with initial configuration.
+        
+        Args:
+            initial_config: Initial configuration dictionary
+            config_path: Path to config file for reloading (optional)
+        """
+        self._config = initial_config
+        self._config_path = config_path
+        self._lock = asyncio.Lock()
+        self._logger = logging.getLogger(__name__)
+    
+    async def reload(self, config_path=None):
+        """Reload configuration from file.
+        
+        Args:
+            config_path: Path to config file (uses stored path if not provided)
+            
+        Returns:
+            New configuration dictionary
+            
+        Raises:
+            Exception if reload fails (keeps existing config)
+        """
+        path = config_path or self._config_path
+        if not path:
+            raise ValueError("No config path specified for reload")
+        
+        async with self._lock:
+            try:
+                # Load new config
+                new_config = load_config(path)
+                
+                # Store old config for rollback if needed
+                old_config = self._config
+                
+                # Update config
+                self._config = new_config
+                self._logger.info(f"Configuration reloaded from {path}")
+                
+                return new_config
+            except Exception as e:
+                self._logger.error(f"Failed to reload config from {path}: {e}", exc_info=True)
+                # Keep existing config on error
+                raise
+    
+    def get(self, key, default=None):
+        """Get a config value (dict-compatible)."""
+        return self._config.get(key, default)
+    
+    def __getitem__(self, key):
+        """Get a config value via subscript (dict-compatible)."""
+        return self._config[key]
+    
+    def __contains__(self, key):
+        """Check if key exists (dict-compatible)."""
+        return key in self._config
+    
+    def keys(self):
+        """Return config keys (dict-compatible)."""
+        return self._config.keys()
+    
+    def items(self):
+        """Return config items (dict-compatible)."""
+        return self._config.items()
+    
+    def values(self):
+        """Return config values (dict-compatible)."""
+        return self._config.values()
+    
+    @property
+    def config(self):
+        """Get the underlying config dict (for components that need full dict)."""
+        return self._config
+
+
 def get_watchhosts(config):
     """Extract watchhosts from config, supporting both new and legacy formats.
     

hbd/server/hbdclass.py

@@ -291,7 +291,6 @@ class Host:
         self.interval = 0
         self.doesack = -1
         self.cmds = []
-        self.cver = 0
         self.connections = {}
         # Plugin data storage: {plugin_name: [(timestamp, data), ...]}
         self.plugin_data = {}
@@ -307,7 +306,6 @@ class Host:
         if self.watched:
             d["name"] = "<b>%s</b>" % d["name"]
         d["dyn"] = str(self.dyn)
-        d["ver"] = str(self.cver)
         d["num"] = self.num
         for c in ["IPv4", "IPv6"]:
             if c in self.connections:
@@ -323,7 +321,6 @@ class Host:
         d = {}
         d["name"] = "Name"
         d["dyn"] = "Dyn"
-        d["ver"] = "Ver"
         d["num"] = "??"
         for c in ["IPv4", "IPv6"]:
             cs = ubConnection.headerdict(c)
@@ -371,9 +368,6 @@ class Host:
     def jsons(self):
         return json.dumps(self.stateinfo())
 
-    def setcver(self, cver):
-        self.cver = cver
-
     def isDynDns(self):
         return self.dyn
 
@@ -483,7 +477,6 @@ class Host:
         "IPv6.state",
         ("IPv6.rtt", 'style="text-align: right;"'),
         ("IPv6.statetime", 'style="text-align: right;"'),
-        "ver",
     ]
 
     hostfields_short = [

hbd/server/http.py

@@ -115,7 +115,7 @@ async def start(
         if uname != "All":
             names = [uname]
         else:
-            names = [n for n in hbdclass.Host.hosts if hbdclass.Host.hosts[n].cver >= 2]
+            names = [n for n in hbdclass.Host.hosts]
         out = []
         for n in names:
             err = None

hbd/server/main.py

@@ -50,19 +50,78 @@ def cleanup_function(config, hbdclass):
     logger.info("Cleanup complete.")
 
 
-async def _run_async(config):
+async def reload_configuration(config_obj, config_path, components):
+    """Reload configuration and update all components.
+    
+    Args:
+        config_obj: ReloadableConfig instance
+        config_path: Path to config file
+        components: Dict with threshold_checker and other components
+        
+    Returns:
+        True if reload succeeded, False otherwise
+    """
+    try:
+        logger.info("=" * 60)
+        logger.info("Starting configuration reload...")
+        logger.info("=" * 60)
+        
+        # Reload config file
+        new_config = await config_obj.reload(config_path)
+        
+        # Update notify module
+        notify_mod.reload_config(new_config)
+        
+        # Reload threshold checker
+        if 'threshold_checker' in components:
+            components['threshold_checker'].reload(new_config)
+        
+        # Note: Changes to the following require restart:
+        # - hb_port, hbd_port, ws_port (already bound)
+        # - SSL certificates (already loaded)
+        # - pickfile (already opened)
+        # - journal settings (journal already initialized)
+        
+        # These are reloadable and effective immediately:
+        # - notification_channels
+        # - threshold_configs
+        # - hosts (watchhosts, dyndnshosts, notification_channels)
+        # - grace period (used on next heartbeat)
+        # - debug/verbose flags (used on next message)
+        
+        logger.info("=" * 60)
+        logger.info("Configuration reload completed successfully")
+        logger.info("=" * 60)
+        return True
+        
+    except Exception as e:
+        logger.error("=" * 60)
+        logger.error(f"Failed to reload configuration: {e}", exc_info=True)
+        logger.error("Keeping previous configuration")
+        logger.error("=" * 60)
+        return False
+
+
+async def _run_async(config, config_path=None):
     loop = asyncio.get_running_loop()
     shutdown_event = asyncio.Event()
+    reload_event = asyncio.Event()
 
-    # Signal handlers for graceful shutdown
+    # Signal handlers for graceful shutdown and reload
     def signal_handler(signum, frame):
         sig_name = signal.Signals(signum).name if hasattr(signal, "Signals") else signum
         logger.info(f"Received {sig_name}, initiating shutdown...")
         loop.call_soon_threadsafe(shutdown_event.set)
+    
+    def reload_handler(signum, frame):
+        sig_name = signal.Signals(signum).name if hasattr(signal, "Signals") else signum
+        logger.info(f"Received {sig_name}, initiating config reload...")
+        loop.call_soon_threadsafe(reload_event.set)
 
     # Register signal handlers
     loop.add_signal_handler(signal.SIGINT, signal_handler, signal.SIGINT, None)
     loop.add_signal_handler(signal.SIGTERM, signal_handler, signal.SIGTERM, None)
+    loop.add_signal_handler(signal.SIGHUP, reload_handler, signal.SIGHUP, None)
 
     from . import http as http_mod
     from . import dns as dns_mod
@@ -83,6 +142,12 @@ async def _run_async(config):
         journal=msg_journal,
     )
     logger.info("Threshold checker initialized")
+    
+    # Components dict for reload orchestration
+    components = {
+        'threshold_checker': threshold_checker,
+        'msg_journal': msg_journal,
+    }
 
     sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
     # Disable IPV6_V6ONLY option to enable dual-stack (listen on IPv4 as well)
@@ -128,7 +193,6 @@ async def _run_async(config):
                 port=config.get("hbd_port", 50004),
                 config=config,
                 hbdclass=hbdclass,
-                threshold_checker=threshold_checker,
                 tcss=None,
                 verbose=config.get("verbose", False),
                 get_now=lambda: time.time(),
@@ -193,10 +257,43 @@ async def _run_async(config):
     except Exception as e:
         logger.exception("websocket server failed to start: %s", e)
 
+    # Main event loop - monitor shutdown and reload events
     try:
-        # run forever until shutdown event is set
-        await shutdown_event.wait()
-        logger.info("Shutdown signal received, stopping services...")
+        while True:
+            # Wait for either shutdown or reload event
+            done, pending = await asyncio.wait(
+                [
+                    asyncio.create_task(shutdown_event.wait()),
+                    asyncio.create_task(reload_event.wait()),
+                ],
+                return_when=asyncio.FIRST_COMPLETED
+            )
+            
+            # Check which event was triggered
+            if shutdown_event.is_set():
+                logger.info("Shutdown signal received, stopping services...")
+                # Cancel pending wait tasks
+                for task in pending:
+                    task.cancel()
+                break
+            
+            if reload_event.is_set():
+                # Clear the event for next reload
+                reload_event.clear()
+                
+                # Cancel pending wait tasks
+                for task in pending:
+                    task.cancel()
+                
+                # Perform reload if config_path is available
+                if config_path:
+                    await reload_configuration(config, config_path, components)
+                else:
+                    logger.warning("Cannot reload: no config path available")
+                
+                # Continue main loop
+                continue
+                
     except Exception as e:
         logger.exception("Error in main loop: %s", e)
     finally:
@@ -298,10 +395,14 @@ def load_pickled_hosts(config, hbdclass):
             logger.info("no pickled data")
 
 
-def run(config):
+def run(config, config_path=None):
     """Start the hbd service (blocking).
 
     Manually manages the event loop to ensure clean shutdown.
+    
+    Args:
+        config: Configuration dictionary
+        config_path: Path to config file (for reload support)
     """
     import os
 
@@ -312,13 +413,18 @@ def run(config):
 
     notify_mod.initlog(logfile=config.get("logfile", "messages.log"))
     eventlog(None, "INFO", f"hbd version {__version__} starting up")
+    
+    if config_path:
+        logger.info(f"Config file: {config_path} (reload with SIGHUP)")
+    else:
+        logger.warning("No config path provided - reload via SIGHUP disabled")
 
     # Create and set the event loop manually
     loop = asyncio.new_event_loop()
     asyncio.set_event_loop(loop)
 
     try:
-        loop.run_until_complete(_run_async(config))
+        loop.run_until_complete(_run_async(config, config_path=config_path))
     except KeyboardInterrupt:
         logger.info("Received KeyboardInterrupt, shutting down...")
     except Exception as e:

hbd/server/notify.py

@@ -62,6 +62,20 @@ def setup(cfg: dict):
     _config = dict(cfg)
 
 
+def reload_config(cfg: dict):
+    """Reload notification configuration.
+    
+    This function updates the module-level notification configuration
+    during runtime config reloads.
+    
+    Args:
+        cfg: New configuration dictionary
+    """
+    global _config
+    _config = dict(cfg)
+    logger.info("Notification configuration reloaded")
+
+
 def send_email(toaddrs, smtpserver, sender, subject, body, debug=0):
     """Send a plain email via SMTP. Returns True on success."""
     try:

hbd/server/threshold.py

@@ -316,6 +316,31 @@ class ThresholdChecker:
                 total_thresholds
             )
     
+    def reload(self, config: Dict[str, Any]):
+        """Reload threshold configuration from new config dict.
+        
+        This clears all existing thresholds and re-parses from the new configuration.
+        Alert states are preserved to maintain hysteresis across reloads.
+        
+        Args:
+            config: New configuration dictionary
+        """
+        logger.info("Reloading threshold configuration...")
+        
+        # Clear old configuration
+        self.threshold_configs.clear()
+        self.thresholds.clear()
+        self.host_config_mapping.clear()
+        
+        # Parse new configuration
+        self._parse_config(config)
+        
+        total_thresholds = sum(len(cfg) for cfg in self.threshold_configs.values())
+        if total_thresholds == 0 and len(self.thresholds) > 0:
+            total_thresholds = len(self.thresholds)
+        
+        logger.info("Threshold configuration reloaded: %d total thresholds", total_thresholds)
+    
     def _parse_config(self, config: Dict[str, Any]):
         """Parse threshold configuration from YAML structure.
         

hbd/server/udp.py

@@ -127,10 +127,7 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
         host.doesack = msg.get("acks", -1)
         # send ACK back
         rmsg = {"time": __import__("time").time()}
-        if host.cver < 1:
-            opkt = b"ACK"
-        else:
-            opkt = dicttos("ACK", rmsg)
+        opkt = dicttos("ACK", rmsg)
         try:
             transport.sendto(opkt, addr)
         except Exception as e:
@@ -174,7 +171,6 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
                     })
                 except Exception:
                     pass
-    host.setcver(msg.get("ver", 0))
 
     try:
         conn, res = host.conndata(cid, ip, rtt, now)
@@ -301,22 +297,11 @@ def handle_datagram(msg: dict, addr, transport, ctx: dict):
             del host.cmds[0]
             if log:
                 log(uname, "command sent")
-            if host.cver < 1:
-                rmsg = rmsg["cmd"]
         elif op == "UPD":
             del host.cmds[0]
             if log:
                 log(uname, "update initiated")
-            if host.cver < 1:
-                if log:
-                    log(uname, " ver 0 does not support UPD")
-                continue
-        if host.cver < 1:
-            opkt = rmsg if isinstance(rmsg, (bytes, str)) else str(rmsg)
-            if isinstance(opkt, str):
-                opkt = opkt.encode()
-        else:
-            opkt = dicttos(op, rmsg)
+        opkt = dicttos(op, rmsg)
         try:
             transport.sendto(opkt, addr)
         except Exception as e:

scripts/demo_http_api.py

@@ -51,7 +51,6 @@ def test_hosts_api():
         print(f"Found {len(hosts)} hosts:\n")
         for host in hosts:
             name = host.get('name', 'unknown')
-            ver = host.get('ver', 0)
             dyn = host.get('dyn', False)
             conn_count = len(host.get('connections', []))
             

test_journal.py

@@ -52,7 +52,6 @@ async def test_basic_logging():
                 'ID': 'HTB',
                 'name': 'testhost1',
                 'interval': 30,
-                'ver': 1
             },
             {
                 'ID': 'PLG',
@@ -146,7 +145,6 @@ async def test_rotation():
                 'ID': 'HTB',
                 'name': f'testhost{i}',
                 'interval': 30,
-                'ver': 1,
                 'data': 'x' * 50  # Add some padding
             }
             await journal.log_message(msg, ('192.168.1.100', 50000 + i), 1000.0 + i)