Praxis Architecture View

Container boundary: apps/nrf52_node

apps/nrf52_node is a C4 Container layer candidate boundary: it must appear as an application, service, data store, runnable unit, or independently deployable/executable system part, rather than a normal directory, code layering, or shared collection of tools.

Container candidate / high 0.1.30-alpha · 34aad0bffa2f / main

C4 hierarchy path

Current layer: Container, which explains an independently understandable application, service, data storage or running unit within the target system.
Upper layer: System Context, indicating which target software system the Container belongs to.
Lower layer: Component, explaining the entrance, interface, orchestration, adaptation, contract or shared object inside the Container.

Responsibility

apps/nrf52_node is an application-level Container candidate: warehouse evidence shows it is close to a runnable entry, a desktop/front-end/back-end application shell, or a user-perceivable system capability.

Boundary

The boundary comes from the warehouse path apps/nrf52_node. C4 Container is not equal to any package or code layer; only boundaries with applications, services, data storage, runtime portals, deployment units, external interfaces or independent execution semantics enter this layer. Ordinary configuration files, document directories, CI directories, warehouse management files and pure code layering can only be used as evidence or software structure model objects, not as Containers.

Relationship

Depends on other Containers: apps/esp32_lvgl, apps/linux_uconsole_gtk, apps/linux_cardputer_zero.
Contains 14 candidate component view objects, 0 run/collaboration links, and 0 run or build nodes.

Relationship with business complexity

This Container is not the business use case itself; it only explains the internal application/service/data storage/operation unit of the software system through which the business capability enters or passes.
If the Use Case in the organization/process model refers to this boundary, how it enters this Container should be explained in the Use Case drill-down document instead of writing the business process into the C4 Container diagram.

Relationship with technical complexity

Corresponds to the software structure model Package Diagram: docs/engineering/package-diagrams/apps-nrf52_node/package-diagram.html.
Continue to enter the software structure model to view drill-down UML, structural collaboration, running links and complexity candidate points.

C4 Container diagram

flowchart LR
  container["apps/nrf52_node"]
  dependency_1["apps/esp32_lvgl"]
  container --> dependency_1
  dependency_2["apps/linux_uconsole_gtk"]
  container --> dependency_2
  dependency_3["apps/linux_cardputer_zero"]
  container --> dependency_3

Explanation of elements in the diagram

apps/nrf52_node

Container · high

This node in the diagram represents apps/nrf52_node, the C4 Container; the current document records 14 component drill-down entries, 0 running collaboration threads and 0 running or build nodes.

Responsibility: apps/nrf52_node is an application-level Container candidate: warehouse evidence shows it is close to a runnable entry, a desktop/front-end/back-end application shell, or a user-perceivable system capability.
Boundary: The boundary comes from the warehouse path apps/nrf52_node; the entry, service interface, application code, running configuration and deployment evidence under this path jointly support it to enter the Container layer. Ordinary configuration files, document directories or pure code layers will not form a Container alone.
Relationship meaning: The figure points from apps/nrf52_node to the external boundary, indicating that this runnable boundary will call, reference or depend on other Containers; these relationships are used to determine deployment, interfaces and change impacts.
Why it belongs to this layer: The node enters the Container layer because the local warehouse evidence shows that it has applications, services, data storage, running portals, deployment units, external interfaces, or independent execution semantics; not because it is just a directory or package.
Drill-down intention: Drill down from apps/nrf52_node to Component to view the decomposition of responsibilities within the boundary.

apps/esp32_lvgl

Container · medium

apps/nrf52_node depends on apps/esp32_lvgl.

Responsibility: apps/nrf52_node depends on apps/esp32_lvgl.
Boundary: apps/esp32_lvgl does not belong to the internal boundaries of apps/nrf52_node; it is only a dependent adjacent module in the current graph.
Relationship meaning: apps/nrf52_node -> apps/esp32_lvgl indicates that there are cross-border calls, references or configuration dependencies in the local warehouse evidence; it illustrates the direction of technical collaboration, but cannot independently prove the business process relationship.
Why it belongs to this layer: apps/esp32_lvgl is projected as an adjacent Container candidate by path ownership, rather than apps/nrf52_node internal Component.
Drill-down intention: Enter the independent Container document of apps/esp32_lvgl to view its own responsibilities and evidence; if there is no independent document, it will only be regarded as an external dependency fact.

apps/linux_uconsole_gtk

Container · medium

apps/nrf52_node depends on apps/linux_uconsole_gtk.

Responsibility: apps/nrf52_node depends on apps/linux_uconsole_gtk.
Boundary: apps/linux_uconsole_gtk does not belong to the internal boundaries of apps/nrf52_node; it is only a dependent adjacent module in the current graph.
Relationship meaning: apps/nrf52_node -> apps/linux_uconsole_gtk indicates that there are cross-border calls, references or configuration dependencies in the local warehouse evidence; it illustrates the direction of technical collaboration, but cannot independently prove the business process relationship.
Why it belongs to this layer: apps/linux_uconsole_gtk is projected as an adjacent Container candidate by path ownership, rather than apps/nrf52_node internal Component.
Drill-down intention: Enter the independent Container document of apps/linux_uconsole_gtk to view its own responsibilities and evidence; if there is no independent document, it will only be regarded as an external dependency fact.

apps/linux_cardputer_zero

Container · medium

apps/nrf52_node depends on apps/linux_cardputer_zero.

Responsibility: apps/nrf52_node depends on apps/linux_cardputer_zero.
Boundary: apps/linux_cardputer_zero does not belong to the internal boundaries of apps/nrf52_node; it is just a dependent adjacent module in the current graph.
Relationship meaning: apps/nrf52_node -> apps/linux_cardputer_zero indicates that there are cross-border calls, references or configuration dependencies in the local warehouse evidence; it illustrates the direction of technical collaboration, but cannot independently prove the business process relationship.
Why it belongs to this layer: apps/linux_cardputer_zero is projected as an adjacent Container candidate by path ownership, rather than apps/nrf52_node internal Component.
Drill-down intention: Enter the independent Container document of apps/linux_cardputer_zero to view its own responsibilities and evidence; if there is no independent document, it will only be regarded as an external dependency fact.

Can drill down to C4

Component responsibility: apps/nrf52_node contains

Enter Component responsibility: apps/nrf52_node can answer "Container boundary: which internal components are hosted by apps/nrf52_node". Focus on portals, orchestration, adaptation, contracts, and shared objects rather than browsing the entire file.

Explain the key responsibility units inside apps/nrf52_node from the C4 Component layer: entry, page, command, interface, registry, adapter or shared object.

Code anchor point: apps/nrf52_node details

Enter code anchor point: apps/nrf52_node to trace the architectural responsibility of container boundary: apps/nrf52_node to the specific file/symbol anchor point; only when you need to determine the implementation entry or the impact of the change, you should drill down to Code.

Explain a few key code anchors in apps/nrf52_node from the C4 Code layer. The Code layer is not a code browser and is only used when you need to understand how architectural components fall into specific files/symbols.

Associated software structure model

apps/nrf52_node Package Diagram related_engineering

View the boundaries, dependencies and complexity candidates of the software structure package/module to which the Container belongs.

Evidence

apps/nrf52_node/APP_SHELL_MANIFEST.md
apps/nrf52_node/library.json
apps/nrf52_node/README.md
apps/nrf52_node/src/nrf52_node_app_facade_runtime.cpp
apps/nrf52_node/src/nrf52_node_app_facade_runtime.h
apps/nrf52_node/src/nrf52_node_app_runtime_access.cpp
apps/nrf52_node/src/nrf52_node_app_runtime_access.h
apps/nrf52_node/src/nrf52_node_app_shell.cpp

Judgment basis

The boundary must be supported by the running entrance, build/deployment configuration, service interface, application entrance, data storage or independent execution evidence; directory name, number of files or number of dependencies alone are not enough to establish.
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