Add configurable variable node initialization for server_registerHEADmaster

New optional CLI argument [nodes-config] lets the server populate its
address space from a dot-indexed config file (node.N.name/type/value/
accessLevel/description).  Supports 10 scalar types plus 1D arrays.

1 files changed, 65 insertions, 1 deletions

diff --git a/readme.md b/readme.md
index 29ee7a7..b334fb2 100644
--- a/readme.md
+++ b/readme.md
@@ -59,7 +59,8 @@ build/bobink_opcua_discovery_server tests/secure_user/server_lds.conf
 
 # 2. Register Server (connects to the LDS on port 14840)
 build/bobink_opcua_server tests/secure_user/server_register.conf \
-  tests/secure_user/server_register_client.conf opc.tcp://localhost:14840
+  tests/secure_user/server_register_client.conf opc.tcp://localhost:14840 \
+  [nodes.conf]
 
 # 3. Find registered servers via the LDS
 build/bobink_opcua_client tests/secure_user/client.conf find-servers opc.tcp://localhost:14840
@@ -123,3 +124,66 @@ Three authentication modes are supported via the `authMode` key:
 - **anonymous** — no user identity
 - **user** — username and password (requires `username` and `password` keys)
 - **cert** — X509 certificate identity token (reuses the application certificate; requires encryption to be configured)
+
+## Nodes Configuration
+
+`bobink_opcua_server` accepts an optional nodes config file that populates
+the server's address space with variable nodes. Pass it as the fourth
+positional argument (before the optional log level):
+
+```sh
+build/bobink_opcua_server server.conf client.conf opc.tcp://localhost:14840 nodes.conf
+```
+
+The file uses the same `key = value` format with dot-indexed keys:
+
+```
+node.0.name = Temperature
+node.0.description = Current temperature reading
+node.0.type = double
+node.0.value = 23.5
+node.0.accessLevel = read
+
+node.1.name = DeviceName
+node.1.type = string
+node.1.value = Sensor-01
+node.1.accessLevel = readwrite
+
+node.2.name = Measurements
+node.2.description = Recent measurements
+node.2.type = double[]
+node.2.value = 1.5, 2.3, 3.7, 4.1
+node.2.accessLevel = read
+```
+
+Each node gets a string NodeId in namespace 1 (`ns=1;s=<name>`). The `name`
+field is also used as the display name and browse name.
+
+### Fields
+
+| Field | Required | Description |
+|-------|----------|-------------|
+| `name` | yes | Display name, browse name, and string NodeId |
+| `description` | no | Human-readable description |
+| `type` | yes | Data type (see table below); append `[]` for a 1D array |
+| `value` | yes | Initial value; comma-separated for arrays |
+| `accessLevel` | yes | `read` or `readwrite` |
+
+### Supported Types
+
+| Type name | OPC UA type |
+|-----------|-------------|
+| `bool` | Boolean (`true` / `false`) |
+| `int16` | Int16 |
+| `uint16` | UInt16 |
+| `int32` | Int32 |
+| `uint32` | UInt32 |
+| `int64` | Int64 |
+| `uint64` | UInt64 |
+| `float` | Float |
+| `double` | Double |
+| `string` | String |
+
+Append `[]` to any type name for a 1D array (e.g. `double[]`, `string[]`).
+Array values are comma-separated. String values in arrays cannot contain
+literal commas.