---
title: "Bridge Component"
description: "A communication bridge component for handling inter-component messaging and registering method calls"
keywords: ["bridge", "communication", "messaging", "inter-component", "method registry", "ESP-32", "industrial"]
---

# BRIDGE

**Path**: [src/Bridge.cpp](../../src/Bridge.cpp)

**Revision History**: Initial documentation

A communication bridge component that facilitates inter-component messaging and method registration. The Bridge acts as a central hub for communication between different system components and provides services for Modbus management.

## REQUIREMENTS

- No specific hardware pins required
- Component base class
- String manipulation capabilities
- Vector container support

## FEATURES

- Component method registration and management
- Inter-component message handling
- Component instance tracking and retrieval
- Debugging and listing capabilities
- Method delimiter-based parsing
- Integration with Modbus Manager

## DEPENDENCIES

- [Component](./Component.md)
- WString
- Vector
- Streaming
- xtypes
- enums
- macros

```mermaid
graph TD;
    Bridge["Bridge"] -->|extends| Component["Component"];
    Bridge -->|uses| WString["WString"];
    Bridge -->|uses| Vector["Vector"];
    Bridge -->|uses| Streaming["Streaming"];
    Bridge -->|uses| xtypes["xtypes"];
    Bridge -->|uses| enums["enums"];
```

## BEHAVIOUR

```mermaid
stateDiagram-v2
    [*] --> INITIALIZATION
    INITIALIZATION --> REGISTRATION : setup()
    REGISTRATION --> READY : register components
    READY --> MESSAGE_HANDLING : onMessage()
    MESSAGE_HANDLING --> DEBUGGING : debug()
    MESSAGE_HANDLING --> READY : return status
    DEBUGGING --> READY
    READY --> LISTING : getComponentList()
    LISTING --> READY
```

## TODOS

### PERFORMANCE

- Implement component method caching for faster lookups
- Optimize memory usage by pre-allocating component storage
- Add method call frequency monitoring
- Consider asynchronous message processing

### SECURITY

- Implement access control for component method registration
- Implement message authentication and encryption
- Add signed message data integrity checks
- Enable inter-component communication logging

### COMPLIANCE

- Ensure error handling complies with industrial standards
- Implement message logging for audit requirements
- Validate time-critical communication performance
- Consider system failover and redundancy in communication

### RECOMMENDATIONS

- Use structured error codes for consistent message handling
- Maintain component hierarchies to maintain clear dependencies
- Implement event driven architecture for inter-component synchronization
- Add component lifecycle tracking

## EXAMPLE

Based on the available header file:

```cpp
#defdef ENABLE_BRIDGE_COMMUNICATION
  bridge = new Bridge(
      this                  // owner
  );
  if (bridge)
  {
    components.push_back(bridge);
    Log.infoln(F("Bridge initialized."));
  }
  else
  {
     Log.errorln(F("Bridge initialization failed."));
  }
#endif
```

### References

${DOXYGEN_PLACEHOLDER}

${VENDOR_PLACEHOLDER}