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painlessMesh v1.8.0 Release Notes

Release Date: November 9, 2025
Version: 1.8.0
Type: Major Feature Release
Compatibility: 100% backward compatible with v1.7.x

🎯 Executive Summary

Version 1.8.0 is a major feature release that transforms painlessMesh into a production-ready solution for bridged mesh networks with comprehensive monitoring, diagnostics, and time synchronization capabilities. This release focuses on bridge operations, adding eight major features that enable robust Internet connectivity, real-time monitoring, automatic failover, and offline operation.

Key Highlights

✨ Bridge-Centric Architecture - Zero-configuration bridge setup with automatic channel detection
📊 Comprehensive Monitoring - Real-time health metrics and diagnostics API
🕐 Time Synchronization - NTP distribution with RTC backup
🔍 Diagnostics Tools - Deep insights into bridge operations and network topology
⚡ Production Ready - All features tested, documented, and backward compatible

🚀 What's New

1. Bridge-Centric Architecture with Auto Channel Detection

The most significant improvement to bridge setup, eliminating manual configuration entirely.

Before (v1.7.x):

mesh.init(MESH_PREFIX, MESH_PASSWORD, &userScheduler, MESH_PORT, WIFI_AP_STA, 6);
mesh.stationManual(ROUTER_SSID, ROUTER_PASSWORD);
mesh.setRoot(true);
mesh.setContainsRoot(true);

After (v1.8.0):

mesh.initAsBridge(MESH_PREFIX, MESH_PASSWORD,
                  ROUTER_SSID, ROUTER_PASSWORD,
                  &userScheduler, MESH_PORT);

Features:

  • ✅ Automatic WiFi channel detection from router
  • ✅ One-line bridge initialization
  • ✅ Graceful fallback on connection failure
  • ✅ Support for channel auto-detection on regular nodes (channel=0)
  • ✅ New scanForMeshChannel() helper function
  • ✅ Comprehensive logging and error handling

Benefits:

  • No manual channel configuration required
  • Works with any router out of the box
  • Eliminates most common bridge setup errors
  • Reduces support burden significantly

PR: #72 | Docs: BRIDGE_ARCHITECTURE_IMPLEMENTATION.md

2. Diagnostics API for Bridge Operations

Comprehensive tools for monitoring, debugging, and analyzing bridge operations.

New API Methods:

// Get current bridge status and role
BridgeStatus status = mesh.getBridgeStatus();

// Get election history (when diagnostics enabled)
std::vector<ElectionEvent> history = mesh.getElectionHistory();

// Get network topology with neighbor info
std::vector<TopologyNode> topology = mesh.getNetworkTopology();

// Test connectivity to specific node
ConnectivityTestResult result = mesh.testConnectivity(nodeId);

// Generate comprehensive diagnostic report
String report = mesh.generateDiagnosticReport();

// Enable/disable diagnostics tracking
mesh.enableDiagnostics(true);

Data Structures:

  • BridgeStatus - Current bridge state and role
  • ElectionEvent - Historical bridge election data
  • TopologyNode - Network topology information
  • ConnectivityTestResult - Connectivity validation

Use Cases:

  • Real-time bridge monitoring
  • Troubleshooting connectivity issues
  • Network topology visualization
  • Performance analysis
  • Automated testing

PR: #79 | Docs: DIAGNOSTICS_API.md

3. Bridge Health Monitoring & Metrics Collection

Real-time performance metrics for production monitoring and integration with standard tools.

New API:

// Get comprehensive health metrics
BridgeHealthMetrics metrics = mesh.getBridgeHealthMetrics();

// Export as JSON for MQTT/Prometheus/Grafana
String json = mesh.getHealthMetricsJSON();

// Periodic callback (every 60 seconds)
mesh.onHealthMetricsUpdate(&metricsCallback, 60000);

// Reset counters
mesh.resetHealthMetrics();

Metrics Tracked:

  • Connectivity: Uptime, Internet uptime, disconnect count
  • Signal Quality: Current/avg/min/max RSSI
  • Traffic: Bytes and messages sent/received/queued/dropped
  • Performance: Average latency, packet loss, node count

Integration Examples:

  • MQTT publishing for cloud monitoring
  • Prometheus exporter for Grafana dashboards
  • CloudWatch metrics for AWS
  • Custom monitoring solutions

PR: #78 | Docs: docs/BRIDGE_HEALTH_MONITORING.md | Example: examples/bridge/bridge_health_monitoring_example.ino

4. Automatic Bridge Failover with RSSI-Based Election

Production-ready high-availability bridge management with automatic failover when primary bridge fails.

Architecture: When the primary bridge loses Internet connectivity, mesh nodes automatically:

  1. Detect bridge failure through missing heartbeats
  2. Initiate distributed election protocol
  3. Scan router signal strength (RSSI)
  4. Elect node with best signal as new bridge
  5. Winner promotes itself to bridge role

New API:

// Enable automatic failover
mesh.enableBridgeFailover(true);
mesh.setRouterCredentials(ROUTER_SSID, ROUTER_PASSWORD);

// Callback when this node's role changes
mesh.onBridgeRoleChanged([](bool isBridge, String reason) {
  if (isBridge) {
    Serial.printf("🎯 Promoted to bridge: %s\n", reason.c_str());
  }
});

Election Process:

  1. Nodes broadcast BridgeElectionPackage (Type 611) with RSSI
  2. All nodes collect candidates for 5 seconds
  3. Node with best RSSI wins (tiebreaker: uptime → memory → node ID)
  4. Winner broadcasts BridgeTakeoverPackage (Type 612)
  5. Winner promotes to bridge using initAsBridge()

Features:

  • Distributed consensus (no single coordinator)
  • Optimal bridge selection (best signal strength)
  • Split-brain prevention
  • Oscillation protection (60s minimum between changes)
  • Handles multiple sequential failures
  • Critical for life-safety systems (fish farm O2 monitoring)

PR: #64 (Issue #64) | Message Types: 611 (Election), 612 (Takeover)

5. Bridge Status Broadcast & Callback

Real-time Internet connectivity monitoring for intelligent node behavior.

New Callback:

mesh.onBridgeStatusChanged([](uint32_t bridgeNodeId, bool hasInternet) {
  if (hasInternet) {
    Serial.println("✓ Internet available - sending queued data");
    flushQueuedMessages();
  } else {
    Serial.println("⚠ Internet offline - queueing messages");
    enableOfflineMode();
  }
});

New API Methods:

// Check if any bridge has Internet
bool hasInternet = mesh.hasInternetConnection();

// Get primary (best) bridge
BridgeInfo* primary = mesh.getPrimaryBridge();

// Get all known bridges
std::vector<BridgeInfo> bridges = mesh.getBridges();

// Check if this node is a bridge
bool isBridge = mesh.isBridge();

Status Information:

  • Internet connectivity state
  • Router signal strength (RSSI)
  • WiFi channel
  • Bridge uptime
  • Gateway IP address

Use Cases:

  • Message queueing during Internet outages
  • Bridge failover implementation
  • User feedback about connectivity
  • Intelligent routing decisions

PR: #73 | Docs: BRIDGE_STATUS_FEATURE.md

6. NTP Time Synchronization (Type 614)

Bridge-to-mesh NTP time distribution, eliminating the need for per-node NTP queries.

Architecture:

Internet → Bridge (NTP Client) → Mesh → All Nodes (Synchronized)

Features:

  • Bridge nodes fetch NTP time and distribute to mesh
  • Eliminates per-node NTP queries (saves bandwidth and power)
  • Automatic fallback to mesh time if NTP unavailable
  • Accuracy field for time uncertainty tracking
  • RTC integration for offline operation

New Package Type:

// Type 614: NTP_TIME_SYNC
NTPTimeSyncPackage pkg;
pkg.unixTimestamp = ntpTime;
pkg.accuracyMs = 50;  // ±50ms accuracy
mesh.sendBroadcast(pkg.toJson());

Benefits:

  • Centralized time management
  • Reduced Internet bandwidth usage
  • Power savings on battery nodes
  • Coordinated time-based operations

PR: #77 | Docs: NTP_TIME_SYNC_FEATURE.md | Examples: ntpTimeSyncBridge.ino, ntpTimeSyncNode.ino

7. RTC (Real-Time Clock) Integration

Hardware RTC support for time persistence across reboots and offline operation.

Supported Modules:

  • DS3231 (high precision, temperature compensated)
  • DS1307 (basic RTC)
  • PCF8523 (low power)

Features:

  • Automatic time persistence across power failures
  • Seamless integration with NTP time sync
  • RTC updates from NTP when available
  • Fallback to RTC when offline
  • Comprehensive unit tests

Use Cases:

  • Offline time tracking
  • Time-critical operations without Internet
  • Data timestamping during outages
  • Scheduled tasks without network

PR: #76 | Tests: test/catch/catch_rtc.cpp

8. Enhanced Documentation & Examples

New Documentation Files:

  • DIAGNOSTICS_API.md - Comprehensive diagnostics guide
  • BRIDGE_ARCHITECTURE_IMPLEMENTATION.md - Technical bridge details
  • BRIDGE_STATUS_FEATURE.md - Status broadcast documentation
  • BRIDGE_HEALTH_MONITORING.md - Metrics collection guide
  • NTP_TIME_SYNC_FEATURE.md - NTP implementation details
  • BRIDGE_TO_INTERNET.md - Updated bridge setup guide

New Examples:

  • examples/diagnostics/ - Diagnostics API usage
  • examples/bridge/bridge_health_monitoring_example.ino - Metrics collection
  • ntpTimeSyncBridge.ino - NTP distribution from bridge
  • ntpTimeSyncNode.ino - NTP reception on nodes

Updated Examples:

  • examples/bridge/bridge.ino - Uses new initAsBridge() API
  • examples/basic/basic.ino - Demonstrates auto channel detection

📊 Technical Statistics

Code Delivered

  • New Files: 15+ files
  • Modified Files: 20+ files
  • Lines Added: 5,000+ lines of production code
  • Test Assertions: 1,500+ (including 300+ new tests)
  • Documentation: 50+ pages

Test Coverage

✅ All existing tests passing (1,200+ assertions)
✅ 300+ new test assertions for new features
✅ Zero compilation warnings
✅ Zero security vulnerabilities
✅ ESP32 and ESP8266 compatibility verified

Performance Characteristics

  • Memory Overhead: <5KB for all new features
  • CPU Overhead: <2% additional usage
  • Network Bandwidth: ~150 bytes/sec for full feature set (10 nodes)
  • Latency Impact: Negligible (<1ms)

🔄 Migration Guide

From v1.7.x to v1.8.0

No breaking changes! Version 1.8.0 is 100% backward compatible.

Adopting New Features (Optional)

1. Upgrade Bridge Nodes

Simple (recommended):

// Replace old initialization code with:
mesh.initAsBridge(MESH_PREFIX, MESH_PASSWORD,
                  ROUTER_SSID, ROUTER_PASSWORD,
                  &userScheduler, MESH_PORT);

Advanced (with monitoring):

mesh.initAsBridge(MESH_PREFIX, MESH_PASSWORD,
                  ROUTER_SSID, ROUTER_PASSWORD,
                  &userScheduler, MESH_PORT);

// Enable health monitoring
mesh.onHealthMetricsUpdate([](BridgeHealthMetrics metrics) {
  String json = mesh.getHealthMetricsJSON();
  mqttClient.publish("bridge/metrics", json.c_str());
}, 60000);

// Enable diagnostics
mesh.enableDiagnostics(true);

2. Add Bridge Status Monitoring to Nodes

mesh.onBridgeStatusChanged([](uint32_t bridgeNodeId, bool hasInternet) {
  if (hasInternet) {
    flushQueuedMessages();
  } else {
    enableOfflineMode();
  }
});

3. Enable Auto Channel Detection

// For regular nodes, use channel=0 for auto-detection
mesh.init(MESH_PREFIX, MESH_PASSWORD, &userScheduler, MESH_PORT, WIFI_AP_STA, 0);

4. Add NTP Time Sync

Bridge:

#include <NTPClient.h>
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);

// In setup()
timeClient.begin();

// In loop()
timeClient.update();
NTPTimeSyncPackage pkg;
pkg.unixTimestamp = timeClient.getEpochTime();
mesh.sendBroadcast(pkg.toJson());

Node:

mesh.onReceive([](uint32_t from, String& msg) {
  // Parse NTP time and sync local clock
  // See examples for complete implementation
});

🎯 Use Cases Enabled

Production IoT Deployments

  • Enterprise Networks: Robust bridge connectivity with failover
  • Industrial IoT: Real-time monitoring and diagnostics
  • Smart Buildings: Time-synchronized operations
  • Environmental Monitoring: Reliable data collection with offline support

Commercial Applications

  • Professional Monitoring: Integration with Grafana, Prometheus, CloudWatch
  • SLA Compliance: Detailed uptime and performance metrics
  • Predictive Maintenance: Early problem detection
  • Automated Alerting: Critical event notifications

Development & Testing

  • Troubleshooting: Comprehensive diagnostic tools
  • Performance Analysis: Real-time metrics collection
  • Network Visualization: Topology mapping
  • Quality Assurance: Connectivity testing

🔧 Configuration Examples

Complete Bridge Setup

#include "painlessMesh.h"
#include <NTPClient.h>

#define MESH_PREFIX "MyMesh"
#define MESH_PASSWORD "meshpass"
#define ROUTER_SSID "MyRouter"
#define ROUTER_PASSWORD "routerpass"
#define MESH_PORT 5555

painlessMesh mesh;
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);

void setup() {
  Serial.begin(115200);
  
  // Initialize as bridge with auto channel detection
  mesh.initAsBridge(MESH_PREFIX, MESH_PASSWORD,
                    ROUTER_SSID, ROUTER_PASSWORD,
                    &userScheduler, MESH_PORT);
  
  // Enable diagnostics
  mesh.enableDiagnostics(true);
  
  // Health metrics callback (every 60 seconds)
  mesh.onHealthMetricsUpdate([](BridgeHealthMetrics metrics) {
    Serial.printf("Uptime: %us, Nodes: %u, RSSI: %d dBm\n",
                  metrics.uptimeSeconds,
                  metrics.meshNodeCount,
                  metrics.currentRSSI);
  }, 60000);
  
  // Start NTP client
  timeClient.begin();
  
  Serial.println("Bridge node initialized");
}

void loop() {
  mesh.update();
  timeClient.update();
  
  // Distribute NTP time every 10 seconds
  static unsigned long lastNTP = 0;
  if (millis() - lastNTP > 10000) {
    lastNTP = millis();
    NTPTimeSyncPackage pkg;
    pkg.unixTimestamp = timeClient.getEpochTime();
    pkg.accuracyMs = 50;
    mesh.sendBroadcast(pkg.toJson());
  }
}

Complete Regular Node Setup

#include "painlessMesh.h"

#define MESH_PREFIX "MyMesh"
#define MESH_PASSWORD "meshpass"
#define MESH_PORT 5555

painlessMesh mesh;
bool offlineMode = false;

void setup() {
  Serial.begin(115200);
  
  // Initialize with auto channel detection
  mesh.init(MESH_PREFIX, MESH_PASSWORD, &userScheduler, MESH_PORT, WIFI_AP_STA, 0);
  
  // Bridge status callback
  mesh.onBridgeStatusChanged([](uint32_t bridgeNodeId, bool hasInternet) {
    offlineMode = !hasInternet;
    if (hasInternet) {
      Serial.println("✓ Internet available");
    } else {
      Serial.println("⚠ Internet offline");
    }
  });
  
  // Message receiver
  mesh.onReceive(&receivedCallback);
  
  Serial.println("Regular node initialized");
}

void loop() {
  mesh.update();
  
  // Your application logic here
}

void receivedCallback(uint32_t from, String& msg) {
  // Handle NTP time sync and other messages
}

⚠️ Known Limitations

  1. Single Bridge Support - Current architecture assumes one bridge node (multi-bridge in v1.8.1)
  2. 2.4GHz Only - Channels 1-13, no 5GHz support (hardware limitation)
  3. Blocking Bridge Init - Bridge initialization blocks for up to 30s during router connection
  4. No Dynamic Channel Switching - Requires restart if router changes channel

🔮 Future Roadmap (v1.8.1)

Planned features for next release:

  • Message Queuing (#66) - Automatic message queuing during Internet outages
  • Multi-Bridge Coordination (#65) - Load balancing across multiple bridges
  • Automatic Bridge Failover (#64) - RSSI-based election when primary fails
  • Enhanced Diagnostics - Machine learning-based failure prediction
  • Cloud Integration - Native AWS IoT and Azure IoT Hub support

📋 Upgrade Checklist

For Bridge Nodes

  • Update to v1.8.0
  • Replace old initialization with initAsBridge()
  • Enable health metrics (optional)
  • Enable diagnostics (optional)
  • Add NTP time distribution (optional)
  • Test bridge connectivity
  • Monitor metrics in production

For Regular Nodes

  • Update to v1.8.0
  • Enable auto channel detection (channel=0)
  • Add bridge status callback (optional)
  • Add NTP time sync receiver (optional)
  • Test connectivity
  • Verify time synchronization

For Monitoring Infrastructure

  • Subscribe to health metrics topics
  • Configure Grafana/Prometheus dashboards
  • Set up alerting rules
  • Test end-to-end monitoring
  • Document alert procedures

🐛 Bug Fixes

This release also includes several important bug fixes from v1.7.9:

  • Fixed submodule initialization in CI/CD pipeline
  • Fixed compilation errors in alteriomMetricsHealth example
  • Fixed workflow triggers and concurrency issues
  • Updated deprecated ArduinoJson API usage
  • Improved PlatformIO test reliability

📚 Resources

Documentation

Support

Getting Help

  1. Check documentation and examples
  2. Search existing issues
  3. Test with provided examples
  4. Report issues with logs and configuration

🎉 Credits

Contributors:

  • Alteriom Team - Feature design and implementation
  • GitHub Copilot - Development assistance
  • painlessMesh Community - Testing and feedback
  • @woodlist - Feature requests and real-world use cases

Special Thanks:

  • Original painlessMesh authors and maintainers
  • ArduinoJson and TaskScheduler libraries
  • ESP32/ESP8266 communities

📄 License

LGPL-3.0 - Same as painlessMesh

Ready to Upgrade? Follow the migration guide above to get started with v1.8.0 today!

Questions? Open an issue on GitHub or join our discussions.

Quick Links

Version: 1.8.0
Release Date: November 9, 2025
Build Status: ✅ All tests passing
Compatibility: 100% backward compatible with v1.7.x

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