First commit

.gitignore

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+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv
+.git

.python-version

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+3.12

README.md

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+# Data Collector Gateway
+
+基于 FastAPI 的 Modbus TCP HTTP 网关，用于通过 HTTP 接口读取 Modbus TCP 设备。
+
+## 环境要求
+
+- Python 3.12+
+
+## 安装
+
+```bash
+uv sync
+```
+
+## 功能
+
+- 原始 Modbus 读取，返回 Modbus Poll 风格的 `Tx/Rx` 通信报文
+- 点位读取，并支持常见寄存器类型的数据转换
+- 支持 Modbus 功能码 `1=线圈输入`、`2=离散量输入`、`3=保持寄存器`、`4=输入寄存器`
+
+## 运行
+
+```bash
+uvicorn main:app --host 0.0.0.0 --port 8000
+```
+
+## 接口
+
+基础路径：`/api/dc-gateway`
+
+| 方法 | 路径 | 说明 |
+|---|---|---|
+| `GET` | `/health` | 健康检查 |
+| `POST` | `/modbus/read` | 原始 Modbus 读取，返回 `communication` 报文 |
+| `POST` | `/modbus/read_points` | 读取点位并返回转换后的值 |
+
+示例：
+
+```bash
+curl -X POST http://127.0.0.1:8000/api/dc-gateway/modbus/read \
+  -H "Content-Type: application/json" \
+  -d '{
+    "device_type": "ModbusTCP",
+    "ip": "192.168.75.240",
+    "port": 505,
+    "word_byte_order": "ABCD",
+    "address_base": 0,
+    "slave_id": 1,
+    "read": {
+      "function_code": 3,
+      "address": 0,
+      "quantity": 4
+    }
+  }'
+```
+
+完整请求和响应约定见 [docs/modbus-http-api.md](docs/modbus-http-api.md)。
+
+## 测试
+
+编译检查：
+
+```bash
+python -m compileall app main.py
+```
+
+集成测试：
+
+```bash
+python -m unittest discover -s intergration/modbus -p "test_*.py"
+```
+
+环境变量：
+
+| 名称 | 默认值 |
+|---|---|
+| `DATA_COLLECTOR_BASE_URL` | `http://127.0.0.1:8000` |
+| `MODBUS_DEVICE_IP` | `192.168.75.240` |
+| `MODBUS_TCP_PORT` | `505` |
+| `MODBUS_SLAVE_ID` | `1` |
+| `REQUEST_TIMEOUT` | `20` |

app/api/modbus.py

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+from typing import Any
+
+from fastapi import APIRouter
+
+from app.schemas.modbus import ModbusPointReadRequest, ModbusRawReadRequest
+from app.services.modbus_service import read_points, read_raw
+
+
+router = APIRouter(tags=["modbus"])
+
+
+@router.get("/health")
+def health() -> dict[str, str]:
+    return {"status": "ok"}
+
+
+@router.post("/modbus/read")
+def modbus_read(request: ModbusRawReadRequest) -> dict[str, Any]:
+    return read_raw(request)
+
+
+@router.post("/modbus/read-points", include_in_schema=False)
+@router.post("/modbus/read_points")
+def modbus_read_points(request: ModbusPointReadRequest) -> dict[str, Any]:
+    return read_points(request)

app/main.py

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+from fastapi import FastAPI, Request
+from fastapi.exceptions import RequestValidationError
+from fastapi.responses import JSONResponse
+
+from app.api.modbus import router as modbus_router
+from app.response import response_payload
+
+
+def validation_error_message(exc: RequestValidationError) -> str:
+    messages: list[str] = []
+    for error in exc.errors():
+        location = ".".join(str(item) for item in error.get("loc", []) if item != "body")
+        message = error.get("msg", "validation error")
+        messages.append(f"{location}: {message}" if location else message)
+    return "; ".join(messages) or "validation error"
+
+
+def create_app() -> FastAPI:
+    app = FastAPI(title="Data Collector Gateway")
+    app.include_router(modbus_router, prefix="/api/dc-gateway")
+
+    @app.exception_handler(RequestValidationError)
+    async def request_validation_exception_handler(
+        request: Request,
+        exc: RequestValidationError,
+    ) -> JSONResponse:
+        data: dict[str, list] = {}
+        if request.url.path.endswith("/modbus/read"):
+            data = {"communication": []}
+        elif request.url.path.endswith(("/modbus/read_points", "/modbus/read-points")):
+            data = {"points": []}
+        return JSONResponse(
+            status_code=200,
+            content=response_payload(1, validation_error_message(exc), data),
+        )
+
+    return app
+
+
+app = create_app()
+
+
+def main() -> None:
+    import uvicorn
+
+    uvicorn.run(app, host="0.0.0.0", port=8000)

app/response.py

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+from typing import Any
+
+
+def response_payload(code: int, msg: str, data: dict[str, Any]) -> dict[str, Any]:
+    return {"code": code, "msg": msg, "data": data}

app/schemas/modbus.py

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+from ipaddress import ip_address
+from typing import Literal
+
+from pydantic import BaseModel, ConfigDict, Field, field_validator, model_validator
+
+
+SUPPORTED_FUNCTION_CODES = {1, 2, 3, 4}
+SUPPORTED_POINT_TYPES = {
+    "bool",
+    "int16",
+    "uint16",
+    "int32",
+    "uint32",
+    "int64",
+    "uint64",
+    "float32",
+    "float64",
+}
+
+
+class ModbusBaseRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    device_type: Literal["ModbusTCP"] = "ModbusTCP"
+    ip: str = Field(min_length=1)
+    port: int = Field(ge=1, le=65535)
+    word_byte_order: Literal["ABCD", "BADC", "CDAB", "DCBA"] = "ABCD"
+    address_base: int = Field(default=0, ge=0)
+    slave_id: int = Field(default=1, ge=0, le=247)
+
+    @field_validator("ip")
+    @classmethod
+    def validate_ip(cls, value: str) -> str:
+        try:
+            ip_address(value)
+        except ValueError as exc:
+            raise ValueError("ip must be a valid IP address") from exc
+        return value
+
+
+class ModbusReadSpec(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    function_code: int
+    address: int = Field(ge=0)
+    quantity: int = Field(ge=1, le=125)
+
+    @field_validator("function_code")
+    @classmethod
+    def validate_function_code(cls, value: int) -> int:
+        if value not in SUPPORTED_FUNCTION_CODES:
+            raise ValueError("function_code must be one of 1, 2, 3, 4")
+        return value
+
+
+class ModbusRawReadRequest(ModbusBaseRequest):
+    read: ModbusReadSpec
+
+
+class ModbusPointSpec(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    function_code: int
+    address: int = Field(ge=0)
+    type: str
+    bit: int | None = Field(default=None, ge=0, le=15)
+
+    @field_validator("function_code")
+    @classmethod
+    def validate_function_code(cls, value: int) -> int:
+        if value not in SUPPORTED_FUNCTION_CODES:
+            raise ValueError("function_code must be one of 1, 2, 3, 4")
+        return value
+
+    @field_validator("type")
+    @classmethod
+    def validate_type(cls, value: str) -> str:
+        normalized = value.lower()
+        if normalized not in SUPPORTED_POINT_TYPES:
+            raise ValueError("type must be one of bool, int16, uint16, int32, uint32, int64, uint64, float32, float64")
+        return normalized
+
+    @model_validator(mode="after")
+    def validate_point(self) -> "ModbusPointSpec":
+        if self.function_code in {1, 2} and self.type != "bool":
+            raise ValueError("function_code 1 and 2 only support bool points")
+        if self.function_code in {1, 2} and self.bit is not None:
+            raise ValueError("bit is only supported for register points")
+        return self
+
+
+class ModbusPointReadRequest(ModbusBaseRequest):
+    points: list[ModbusPointSpec] = Field(min_length=1)

app/services/modbus_codec.py

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+from __future__ import annotations
+
+import struct
+from typing import Any
+
+
+def register_quantity_for_type(point_type: str) -> int:
+    if point_type in {"bool", "int16", "uint16"}:
+        return 1
+    if point_type in {"int64", "uint64", "float64"}:
+        return 4
+    return 2
+
+
+def ordered_bytes(registers: list[int], word_byte_order: str) -> bytes:
+    raw = b"".join(register.to_bytes(2, byteorder="big", signed=False) for register in registers)
+    words = [raw[index : index + 2] for index in range(0, len(raw), 2)]
+    if word_byte_order in {"BADC", "DCBA"}:
+        words = [word[::-1] for word in words]
+    if word_byte_order in {"CDAB", "DCBA"}:
+        words = list(reversed(words))
+    return b"".join(words)
+
+
+def convert_register_value(registers: list[int], point_type: str, word_byte_order: str, bit: int | None) -> Any:
+    if point_type == "bool":
+        value = registers[0]
+        if bit is None:
+            return value != 0
+        return ((value >> bit) & 1) == 1
+
+    payload = ordered_bytes(registers, word_byte_order)
+
+    if point_type == "int16":
+        return int.from_bytes(payload, byteorder="big", signed=True)
+    if point_type == "uint16":
+        return int.from_bytes(payload, byteorder="big", signed=False)
+    if point_type == "int32":
+        return int.from_bytes(payload, byteorder="big", signed=True)
+    if point_type == "uint32":
+        return int.from_bytes(payload, byteorder="big", signed=False)
+    if point_type == "int64":
+        return int.from_bytes(payload, byteorder="big", signed=True)
+    if point_type == "uint64":
+        return int.from_bytes(payload, byteorder="big", signed=False)
+    if point_type == "float32":
+        return struct.unpack(">f", payload)[0]
+    if point_type == "float64":
+        return struct.unpack(">d", payload)[0]
+
+    raise ValueError(f"unsupported point type: {point_type}")

app/services/modbus_service.py

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+from __future__ import annotations
+
+from collections.abc import Callable
+from typing import Any
+
+from pymodbus.client import ModbusTcpClient
+
+from app.response import response_payload
+from app.schemas.modbus import ModbusPointReadRequest, ModbusRawReadRequest
+from app.services.modbus_codec import convert_register_value, register_quantity_for_type
+
+
+class ModbusCommunicationError(RuntimeError):
+    def __init__(self, message: str) -> None:
+        super().__init__(message)
+
+
+class PacketTrace:
+    def __init__(self) -> None:
+        self._sequence = 0
+        self._messages: list[str] = []
+
+    def capture(self, sending: bool, data: bytes) -> bytes:
+        self._sequence += 1
+        direction = "Tx" if sending else "Rx"
+        payload = " ".join(f"{value:02X}" for value in data)
+        self._messages.append(f"{direction}:{self._sequence:03d}-{payload}")
+        return data
+
+    def as_list(self) -> list[str]:
+        return list(self._messages)
+
+
+def calculate_protocol_address(address: int, address_base: int) -> int:
+    return address + address_base
+
+
+def function_name(function_code: int) -> str:
+    return {
+        1: "read_coils",
+        2: "read_discrete_inputs",
+        3: "read_holding_registers",
+        4: "read_input_registers",
+    }[function_code]
+
+
+def create_client(ip: str, port: int, trace_packet: Callable[[bool, bytes], bytes]) -> ModbusTcpClient:
+    client = ModbusTcpClient(host=ip, port=port, trace_packet=trace_packet)
+    if not client.connect():
+        raise ModbusCommunicationError(f"failed to connect to {ip}:{port}")
+    return client
+
+
+def read_modbus_values(
+    client: ModbusTcpClient,
+    function_code: int,
+    protocol_address: int,
+    quantity: int,
+    slave_id: int,
+) -> list[int] | list[bool]:
+    if function_code == 1:
+        response = client.read_coils(address=protocol_address, count=quantity, device_id=slave_id)
+    elif function_code == 2:
+        response = client.read_discrete_inputs(address=protocol_address, count=quantity, device_id=slave_id)
+    elif function_code == 3:
+        response = client.read_holding_registers(address=protocol_address, count=quantity, device_id=slave_id)
+    elif function_code == 4:
+        response = client.read_input_registers(address=protocol_address, count=quantity, device_id=slave_id)
+    else:
+        raise ValueError("function_code must be one of 1, 2, 3, 4")
+
+    if response.isError():
+        raise ModbusCommunicationError(str(response))
+
+    if function_code in {1, 2}:
+        return [bool(value) for value in response.bits[:quantity]]
+    return [int(value) for value in response.registers[:quantity]]
+
+
+def device_payload(request: ModbusRawReadRequest | ModbusPointReadRequest) -> dict[str, Any]:
+    return {
+        "device_type": request.device_type,
+        "ip": request.ip,
+        "port": request.port,
+        "word_byte_order": request.word_byte_order,
+        "address_base": request.address_base,
+        "slave_id": request.slave_id,
+    }
+
+
+def read_raw(request: ModbusRawReadRequest) -> dict[str, Any]:
+    trace = PacketTrace()
+    client: ModbusTcpClient | None = None
+
+    try:
+        client = create_client(request.ip, request.port, trace.capture)
+        read_modbus_values(
+            client=client,
+            function_code=request.read.function_code,
+            protocol_address=calculate_protocol_address(request.read.address, request.address_base),
+            quantity=request.read.quantity,
+            slave_id=request.slave_id,
+        )
+    except ModbusCommunicationError as exc:
+        return response_payload(1, str(exc), {"device": device_payload(request), "communication": trace.as_list()})
+    except Exception as exc:
+        return response_payload(1, str(exc), {"device": device_payload(request), "communication": trace.as_list()})
+    finally:
+        if client is not None:
+            client.close()
+
+    return response_payload(0, "success", {"device": device_payload(request), "communication": trace.as_list()})
+
+
+def read_points(request: ModbusPointReadRequest) -> dict[str, Any]:
+    trace = PacketTrace()
+    client: ModbusTcpClient | None = None
+    points: list[dict[str, Any]] = []
+
+    try:
+        client = create_client(request.ip, request.port, trace.capture)
+        for point in request.points:
+            quantity = register_quantity_for_type(point.type)
+            protocol_address = calculate_protocol_address(point.address, request.address_base)
+            raw_values = read_modbus_values(
+                client=client,
+                function_code=point.function_code,
+                protocol_address=protocol_address,
+                quantity=quantity,
+                slave_id=request.slave_id,
+            )
+
+            if point.function_code in {1, 2}:
+                value = bool(raw_values[0])
+            else:
+                value = convert_register_value(
+                    registers=[int(value) for value in raw_values],
+                    point_type=point.type,
+                    word_byte_order=request.word_byte_order,
+                    bit=point.bit,
+                )
+
+            result = {
+                "function_code": point.function_code,
+                "address": point.address,
+                "type": point.type,
+                "value": value,
+            }
+            if point.bit is not None:
+                result["bit"] = point.bit
+            points.append(result)
+    except ModbusCommunicationError as exc:
+        return response_payload(1, str(exc), {"device": device_payload(request), "points": points})
+    except Exception as exc:
+        return response_payload(1, str(exc), {"device": device_payload(request), "points": points})
+    finally:
+        if client is not None:
+            client.close()
+
+    return response_payload(0, "success", {"device": device_payload(request), "points": points})

docs/modbus-http-api.md

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+# Modbus HTTP 接口说明
+
+## 目标
+
+本服务通过 HTTP 接口连接 Modbus TCP 设备，并返回与 Modbus Poll `Communication` 窗口一致风格的原始 Tx/Rx 报文。
+
+当前仅支持 `ModbusTCP`。
+
+## 接口列表
+
+- `POST /api/dc-gateway/modbus/read`：原始 Modbus 读取，只返回通信报文，不返回解析值。
+- `POST /api/dc-gateway/modbus/read_points`：按点位定义读取，返回点位值。
+- `GET /api/dc-gateway/health`：健康检查。
+
+## 通用返回约定
+
+接口业务结果统一使用 HTTP `200` 返回，是否成功由 JSON 中的 `code` 判断。
+
+成功：
+
+```json
+{
+  "code": 0,
+  "msg": "success",
+  "data": {}
+}
+```
+
+失败：
+
+```json
+{
+  "code": 1,
+  "msg": "failed to connect to 192.168.75.240:505",
+  "data": {}
+}
+```
+
+`data` 固定为对象。两个 Modbus 读取接口都会在 `data.device` 返回设备信息；`/modbus/read` 的通信报文返回在 `data.communication`；`/modbus/read_points` 的点位返回在 `data.points`。
+
+## 设备参数校验
+
+| 字段 | 是否必传 | 校验 |
+|---|---|---|
+| `device_type` | 否 | 默认 `ModbusTCP`，目前仅支持 `ModbusTCP` |
+| `ip` | 是 | 必须是合法 IP 地址 |
+| `port` | 是 | `1 <= port <= 65535` |
+| `word_byte_order` | 否 | 默认 `ABCD`，可选 `ABCD`、`BADC`、`CDAB`、`DCBA` |
+| `address_base` | 否 | 默认 `0`，必须大于等于 `0` |
+| `slave_id` | 否 | 默认 `1`，范围 `0..247` |
+
+## communication 格式
+
+`communication` 是字符串数组，每项格式如下：
+
+```text
+Tx:001-00 00 33 00 00 00 06 01 03 00 00 00 04
+Rx:002-00 00 33 00 00 00 0B 01 03 08 00 01 42 A8 00 00 40 F8
+```
+
+说明：
+
+- `Tx` 表示发送给设备的 Modbus TCP ADU。
+- `Rx` 表示设备返回的 Modbus TCP ADU。
+- `001`、`002` 是当前 HTTP 请求内的报文序号。
+- `-` 后面是大写十六进制字节，使用空格分隔。
+- 每个 HTTP 请求都会创建独立 trace，不使用全局 trace，并发请求不会互相清空或串包。
+- 若 pymodbus 因重试产生多次发送/接收，数组会包含多条 `Tx/Rx`。
+
+## 地址规则
+
+接口只按照入参格式处理地址。`address_base` 作为显式地址偏移，实际发送给 Modbus 协议的地址为：
+
+```python
+protocol_address = address + address_base
+```
+
+常规情况下传：
+
+```json
+"address_base": 0
+```
+
+## Function Code
+
+支持以下功能码：
+
+| function_code | 含义 |
+|---:|---|
+| 1 | 读线圈 Read Coils |
+| 2 | 读离散输入 Read Discrete Inputs |
+| 3 | 读保持寄存器 Read Holding Registers |
+| 4 | 读输入寄存器 Read Input Registers |
+
+## 读取数量限制
+
+`/api/dc-gateway/modbus/read` 的 `quantity` 范围为：
+
+```text
+1 <= quantity <= 125
+```
+
+超过范围不会返回 HTTP `422`，而是返回：
+
+```json
+{
+  "code": 1,
+  "msg": "read.quantity: Input should be less than or equal to 125",
+  "data": {
+    "communication": []
+  }
+}
+```
+
+## 接口一：原始读取
+
+### URL
+
+```http
+POST /api/dc-gateway/modbus/read
+```
+
+### 请求体
+
+```json
+{
+  "device_type": "ModbusTCP",
+  "ip": "192.168.75.240",
+  "port": 505,
+  "word_byte_order": "ABCD",
+  "address_base": 0,
+  "slave_id": 1,
+  "read": {
+    "function_code": 3,
+    "address": 0,
+    "quantity": 4
+  }
+}
+```
+
+### 成功返回
+
+```json
+{
+  "code": 0,
+  "msg": "success",
+  "data": {
+    "device": {
+      "device_type": "ModbusTCP",
+      "ip": "192.168.75.240",
+      "port": 505,
+      "word_byte_order": "ABCD",
+      "address_base": 0,
+      "slave_id": 1
+    },
+    "communication": [
+      "Tx:001-00 00 33 00 00 00 06 01 03 00 00 00 04",
+      "Rx:002-00 00 33 00 00 00 0B 01 03 08 00 01 42 A8 00 00 40 F8"
+    ]
+  }
+}
+```
+
+该接口不返回 `values`。如果需要按 `int16`、`float32` 等类型解析数据，请使用点位读取接口。
+
+### 错误返回
+
+```json
+{
+  "code": 1,
+  "msg": "Modbus Error: [Input/Output] No response received after 3 retries, continue with next request",
+  "data": {
+    "device": {
+      "device_type": "ModbusTCP",
+      "ip": "192.168.75.240",
+      "port": 505,
+      "word_byte_order": "ABCD",
+      "address_base": 0,
+      "slave_id": 1
+    },
+    "communication": [
+      "Tx:001-00 00 33 00 00 00 06 01 03 00 00 00 04"
+    ]
+  }
+}
+```
+
+## 接口二：点位读取并转换
+
+### URL
+
+```http
+POST /api/dc-gateway/modbus/read_points
+```
+
+### 请求体
+
+```json
+{
+  "device_type": "ModbusTCP",
+  "ip": "192.168.75.240",
+  "port": 505,
+  "word_byte_order": "ABCD",
+  "address_base": 0,
+  "slave_id": 1,
+  "points": [
+    {
+      "function_code": 3,
+      "address": 7,
+      "type": "int16"
+    },
+    {
+      "function_code": 3,
+      "address": 1,
+      "type": "float32"
+    },
+    {
+      "function_code": 1,
+      "address": 0,
+      "type": "bool"
+    }
+  ]
+}
+```
+
+### 支持的数据类型
+
+| 类型 | 读取长度 | 说明 |
+|---|---:|---|
+| `bool` | 1 bit 或 1 register | 布尔值 |
+| `int16` | 1 register | 有符号 16 位整数 |
+| `uint16` | 1 register | 无符号 16 位整数 |
+| `int32` | 2 registers | 有符号 32 位整数 |
+| `uint32` | 2 registers | 无符号 32 位整数 |
+| `float32` | 2 registers | IEEE 754 单精度浮点数 |
+| `int64` | 4 registers | 有符号 64 位整数 |
+| `uint64` | 4 registers | 无符号 64 位整数 |
+| `float64` | 4 registers | IEEE 754 双精度浮点数 |
+
+### 成功返回
+
+```json
+{
+  "code": 0,
+  "msg": "success",
+  "data": {
+    "device": {
+      "device_type": "ModbusTCP",
+      "ip": "192.168.75.240",
+      "port": 505,
+      "word_byte_order": "ABCD",
+      "address_base": 0,
+      "slave_id": 1
+    },
+    "points": [
+      {
+        "function_code": 3,
+        "address": 7,
+        "type": "int16",
+        "value": -321
+      }
+    ]
+  }
+}
+```
+
+## 运行方式
+
+```bash
+uvicorn main:app --host 0.0.0.0 --port 8000
+```
+
+也可以直接运行：
+
+```bash
+python main.py
+```
+
+## 验证方式
+
+编译检查：
+
+```bash
+python -m compileall app main.py
+```
+
+调用原始读取接口：
+
+```bash
+curl -X POST http://127.0.0.1:8000/api/dc-gateway/modbus/read \
+  -H "Content-Type: application/json" \
+  -d '{
+    "device_type": "ModbusTCP",
+    "ip": "192.168.75.240",
+    "port": 505,
+    "word_byte_order": "ABCD",
+    "address_base": 0,
+    "slave_id": 1,
+    "read": {
+      "function_code": 3,
+      "address": 0,
+      "quantity": 4
+    }
+  }'
+```
+
+运行接口测试：
+
+```bash
+python -m unittest discover -s intergration/modbus -p "test_*.py"
+```
+
+默认测试设备参数参考 `D:\Projects\BACnet-Client\autotest\Integration\modbus`：
+
+```text
+MODBUS_DEVICE_IP=192.168.75.240
+MODBUS_TCP_PORT=505
+MODBUS_SLAVE_ID=1
+```
+
+可通过环境变量覆盖：
+
+```bash
+set DATA_COLLECTOR_BASE_URL=http://127.0.0.1:8000
+set MODBUS_DEVICE_IP=192.168.75.240
+set MODBUS_TCP_PORT=505
+set MODBUS_SLAVE_ID=1
+```

intergration/modbus/common.py

@@ -0,0 +1,110 @@
+import json
+import os
+import re
+import urllib.error
+import urllib.request
+
+
+BASE_URL = os.getenv("DATA_COLLECTOR_BASE_URL", "http://127.0.0.1:8000").rstrip("/")
+REQUEST_TIMEOUT = int(os.getenv("REQUEST_TIMEOUT", "20"))
+
+DEVICE_IP = os.getenv("MODBUS_DEVICE_IP", "192.168.75.240")
+MODBUS_TCP_PORT = int(os.getenv("MODBUS_TCP_PORT", "505"))
+SLAVE_ID = int(os.getenv("MODBUS_SLAVE_ID", "1"))
+
+FUNC_CODE_COIL = 1
+FUNC_CODE_DISCRETE_INPUT = 2
+FUNC_CODE_HOLDING_REGISTER = 3
+FUNC_CODE_INPUT_REGISTER = 4
+
+REGISTER_POINT_SAMPLES = [
+    {"address": 0, "type": "bool", "bit": 0},
+    {"address": 1, "type": "float32"},
+    {"address": 3, "type": "float64"},
+    {"address": 7, "type": "int16"},
+    {"address": 8, "type": "uint16"},
+    {"address": 9, "type": "int32"},
+    {"address": 11, "type": "uint32"},
+    {"address": 13, "type": "int64"},
+    {"address": 17, "type": "uint64"},
+]
+
+FRAME_PATTERN = re.compile(r"^(Tx|Rx):\d{3}-[0-9A-F]{2}(?: [0-9A-F]{2})*$")
+
+
+def post_json(path: str, payload: dict) -> tuple[int, dict]:
+    data = json.dumps(payload).encode("utf-8")
+    request = urllib.request.Request(
+        f"{BASE_URL}{path}",
+        data=data,
+        headers={"Content-Type": "application/json"},
+        method="POST",
+    )
+    try:
+        with urllib.request.urlopen(request, timeout=REQUEST_TIMEOUT) as response:
+            body = response.read().decode("utf-8")
+            return response.status, json.loads(body)
+    except urllib.error.HTTPError as exc:
+        body = exc.read().decode("utf-8")
+        return exc.code, json.loads(body)
+
+
+def raw_read_payload(function_code: int, address: int, quantity: int) -> dict:
+    return {
+        "device_type": "ModbusTCP",
+        "ip": DEVICE_IP,
+        "port": MODBUS_TCP_PORT,
+        "word_byte_order": "ABCD",
+        "address_base": 0,
+        "slave_id": SLAVE_ID,
+        "read": {
+            "function_code": function_code,
+            "address": address,
+            "quantity": quantity,
+        },
+    }
+
+
+def point_read_payload(points: list[dict]) -> dict:
+    return {
+        "device_type": "ModbusTCP",
+        "ip": DEVICE_IP,
+        "port": MODBUS_TCP_PORT,
+        "word_byte_order": "ABCD",
+        "address_base": 0,
+        "slave_id": SLAVE_ID,
+        "points": points,
+    }
+
+
+def all_type_point_specs() -> list[dict]:
+    points = []
+    for function_code in [FUNC_CODE_COIL, FUNC_CODE_DISCRETE_INPUT]:
+        for address in [0, 1, 16, 17]:
+            points.append({"function_code": function_code, "address": address, "type": "bool"})
+    for function_code in [FUNC_CODE_HOLDING_REGISTER, FUNC_CODE_INPUT_REGISTER]:
+        for sample in REGISTER_POINT_SAMPLES:
+            point = {"function_code": function_code, "address": sample["address"], "type": sample["type"]}
+            if "bit" in sample:
+                point["bit"] = sample["bit"]
+            points.append(point)
+    return points
+
+
+def parse_frame(frame: str) -> tuple[str, list[int]]:
+    direction, payload = frame.split("-", 1)
+    return direction[:2], [int(item, 16) for item in payload.split()]
+
+
+def assert_response_contract(testcase, status: int, data: dict) -> None:
+    testcase.assertEqual(200, status, data)
+    testcase.assertIn("code", data)
+    testcase.assertIn("msg", data)
+    testcase.assertIn("data", data)
+    testcase.assertIsInstance(data["data"], dict)
+
+
+def assert_frame_format(testcase, communication: list[str]) -> None:
+    testcase.assertTrue(communication, "communication should not be empty")
+    for frame in communication:
+        testcase.assertRegex(frame, FRAME_PATTERN)

intergration/modbus/test_modbus_read_api.py

@@ -0,0 +1,108 @@
+import unittest
+
+from common import (
+    FUNC_CODE_COIL,
+    FUNC_CODE_DISCRETE_INPUT,
+    FUNC_CODE_HOLDING_REGISTER,
+    FUNC_CODE_INPUT_REGISTER,
+    all_type_point_specs,
+    assert_frame_format,
+    assert_response_contract,
+    parse_frame,
+    point_read_payload,
+    post_json,
+    raw_read_payload,
+)
+
+
+def expected_device(payload):
+    return {
+        "device_type": payload["device_type"],
+        "ip": payload["ip"],
+        "port": payload["port"],
+        "word_byte_order": payload["word_byte_order"],
+        "address_base": payload["address_base"],
+        "slave_id": payload["slave_id"],
+    }
+
+
+class ModbusReadApiIntegrationTest(unittest.TestCase):
+    def test_raw_read_returns_modbus_poll_style_communication(self):
+        payload = raw_read_payload(FUNC_CODE_HOLDING_REGISTER, address=0, quantity=4)
+        status, data = post_json(
+            "/api/dc-gateway/modbus/read",
+            payload,
+        )
+
+        assert_response_contract(self, status, data)
+        self.assertEqual(0, data["code"], data)
+        self.assertEqual("success", data["msg"])
+        self.assertNotIn("values", data)
+        self.assertNotIn("communication", data)
+        self.assertNotIn("device", data)
+        self.assertEqual(expected_device(payload), data["data"]["device"])
+        communication = data["data"]["communication"]
+        assert_frame_format(self, communication)
+
+        tx_frames = [parse_frame(frame)[1] for frame in communication if frame.startswith("Tx:")]
+        rx_frames = [parse_frame(frame)[1] for frame in communication if frame.startswith("Rx:")]
+        self.assertTrue(tx_frames, data)
+        self.assertTrue(rx_frames, data)
+
+        tx = tx_frames[0]
+        self.assertGreaterEqual(len(tx), 12)
+        self.assertEqual(FUNC_CODE_HOLDING_REGISTER, tx[7])
+        self.assertEqual([0x00, 0x00], tx[8:10])
+        self.assertEqual([0x00, 0x04], tx[10:12])
+
+        rx = rx_frames[0]
+        self.assertGreaterEqual(len(rx), 9)
+        self.assertEqual(FUNC_CODE_HOLDING_REGISTER, rx[7])
+        self.assertEqual(8, rx[8])
+
+    def test_read_points_returns_all_function_codes_and_types(self):
+        payload = point_read_payload(all_type_point_specs())
+
+        status, data = post_json("/api/dc-gateway/modbus/read_points", payload)
+
+        assert_response_contract(self, status, data)
+        self.assertEqual(0, data["code"], data)
+        self.assertNotIn("communication", data)
+        self.assertNotIn("device", data)
+        self.assertEqual(expected_device(payload), data["data"]["device"])
+        points = data["data"]["points"]
+        self.assertEqual(len(payload["points"]), len(points))
+        seen = {(point["function_code"], point["address"], point["type"], point.get("bit")) for point in points}
+        expected = {(point["function_code"], point["address"], point["type"], point.get("bit")) for point in payload["points"]}
+        self.assertEqual(expected, seen)
+        self.assertTrue(any(point["function_code"] == FUNC_CODE_COIL for point in points))
+        self.assertTrue(any(point["function_code"] == FUNC_CODE_DISCRETE_INPUT for point in points))
+        self.assertTrue(any(point["function_code"] == FUNC_CODE_HOLDING_REGISTER for point in points))
+        self.assertTrue(any(point["function_code"] == FUNC_CODE_INPUT_REGISTER for point in points))
+        for point in points:
+            self.assertIn("value", point)
+            self.assertNotIn("address_base", point)
+            self.assertNotIn("protocol_address", point)
+            self.assertNotIn("raw_values", point)
+            self.assertNotIn("communication", point)
+            if point["type"] == "bool":
+                self.assertIsInstance(point["value"], bool)
+            elif point["type"].startswith("float"):
+                self.assertIsInstance(point["value"], float)
+            else:
+                self.assertIsInstance(point["value"], int)
+
+    def test_validation_error_returns_http_200_contract(self):
+        status, data = post_json(
+            "/api/dc-gateway/modbus/read",
+            raw_read_payload(FUNC_CODE_HOLDING_REGISTER, address=0, quantity=126),
+        )
+
+        assert_response_contract(self, status, data)
+        self.assertEqual(1, data["code"], data)
+        self.assertIn("quantity", data["msg"])
+        self.assertEqual([], data["data"]["communication"])
+
+
+if __name__ == "__main__":
+    unittest.main()

intergration/modbus/test_modbus_schema.py

@@ -0,0 +1,39 @@
+import unittest
+
+from pydantic import ValidationError
+
+from app.schemas.modbus import ModbusRawReadRequest
+
+
+class ModbusSchemaTest(unittest.TestCase):
+    def test_device_type_defaults_to_modbus_tcp(self):
+        request = ModbusRawReadRequest(
+            ip="192.168.75.248",
+            port=5512,
+            read={"function_code": 3, "address": 0, "quantity": 10},
+        )
+
+        self.assertEqual("ModbusTCP", request.device_type)
+
+    def test_port_is_required(self):
+        with self.assertRaises(ValidationError) as context:
+            ModbusRawReadRequest(
+                ip="192.168.75.248",
+                read={"function_code": 3, "address": 0, "quantity": 10},
+            )
+
+        self.assertIn("port", str(context.exception))
+
+    def test_ip_must_be_valid_address(self):
+        with self.assertRaises(ValidationError) as context:
+            ModbusRawReadRequest(
+                ip="not-an-ip",
+                port=5512,
+                read={"function_code": 3, "address": 0, "quantity": 10},
+            )
+
+        self.assertIn("ip must be a valid IP address", str(context.exception))
+
+
+if __name__ == "__main__":
+    unittest.main()

main.py

@@ -0,0 +1,5 @@
+from app.main import app, main
+
+
+if __name__ == "__main__":
+    main()

pyproject.toml

@@ -0,0 +1,15 @@
+[project]
+name = "data-collector-gateway"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "fastapi>=0.115.0",
+    "pydantic>=2.13.4",
+    "pymodbus>=3.13.1",
+    "uvicorn>=0.32.0",
+]
+
+[project.scripts]
+data-collector-api = "main:main"

uv.lock

@@ -0,0 +1,254 @@
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