Refactor SunSpec model types

src/sunspec/connection/base.ts

@@ -174,10 +174,6 @@ export abstract class SunSpecConnection {
             address,
         });
 
-        if (data.ID !== 1) {
-            throw new Error('Not a SunSpec common model');
-        }
-
         // cache common model
         // this is not expected to ever change so it can be persisted
         this.commonModelCache = data;

src/sunspec/connection/inverter.ts

@@ -28,10 +28,6 @@ export class InverterSunSpecConnection extends SunSpecConnection {
             address,
         });
 
-        if (data.ID !== 101 && data.ID !== 102 && data.ID !== 103) {
-            throw new Error('Not a SunSpec inverter monitoring model');
-        }
-
         return data;
     }
 
@@ -53,10 +49,6 @@ export class InverterSunSpecConnection extends SunSpecConnection {
             address,
         });
 
-        if (data.ID !== 120) {
-            throw new Error('Not a SunSpec nameplate model');
-        }
-
         this.nameplateModelCache = data;
 
         return data;
@@ -76,10 +68,6 @@ export class InverterSunSpecConnection extends SunSpecConnection {
             address,
         });
 
-        if (data.ID !== 121) {
-            throw new Error('Not a SunSpec settings model');
-        }
-
         return data;
     }
 
@@ -97,10 +85,6 @@ export class InverterSunSpecConnection extends SunSpecConnection {
             address,
         });
 
-        if (data.ID !== 122) {
-            throw new Error('Not a SunSpec status model');
-        }
-
         return data;
     }
 
@@ -118,10 +102,6 @@ export class InverterSunSpecConnection extends SunSpecConnection {
             address,
         });
 
-        if (data.ID !== 123) {
-            throw new Error('Not a SunSpec controls model');
-        }
-
         return data;
     }
 

src/sunspec/connection/meter.ts

@@ -19,10 +19,6 @@ export class MeterSunSpecConnection extends SunSpecConnection {
             address,
         });
 
-        if (data.ID !== 201 && data.ID !== 202 && data.ID !== 203) {
-            throw new Error('Not a SunSpec meter model');
-        }
-
         return data;
     }
 }

src/sunspec/helpers/converters.test.ts

@@ -4,6 +4,7 @@ import {
     int16ToRegisters,
     registersToAcc32,
     registersToAcc64BigInt,
+    registersToId,
     registersToInt16,
     registersToInt16Nullable,
     registersToString,
@@ -122,3 +123,31 @@ it('int16ToRegistersNullable should convert null to registers', () => {
     const result = int16NullableToRegisters(value);
     expect(result).toEqual([0x8000]);
 });
+
+describe('registersToId', () => {
+    it('registersToId should convert register to a ID number', () => {
+        const registers = [0x0002];
+        const result = registersToId(registers, 2);
+        expect(result).toBe(2);
+    });
+
+    it('registersToId should throw if register does not match ID number', () => {
+        const registers = [0x0004];
+        expect(() => registersToId(registers, 2)).toThrowError(
+            'Invalid model ID value',
+        );
+    });
+
+    it('registersToId should convert register to a ID number array', () => {
+        const registers = [0x0003];
+        const result = registersToId(registers, [2, 3, 4]);
+        expect(result).toBe(3);
+    });
+
+    it('registersToId should throw if register does not match ID number array', () => {
+        const registers = [0x0005];
+        expect(() => registersToId(registers, [2, 3, 4])).toThrowError(
+            'Invalid model ID value',
+        );
+    });
+});

src/sunspec/helpers/converters.ts

@@ -141,3 +141,27 @@ export function registersToAcc64BigInt(registers: number[]): bigint {
         BigInt(registers[3]!)
     );
 }
+
+export function registersToId<ID extends number>(
+    registers: number[],
+    value: ID | ID[],
+): ID {
+    const registerValue = registersToUint16(registers);
+
+    if (typeof value === 'number') {
+        if (registerValue !== value) {
+            throw new Error(
+                `Invalid model ID value, expected ${value}, got ${registerValue}`,
+            );
+        }
+        return value;
+    }
+
+    if (value.some((v) => v === registerValue)) {
+        return registerValue as ID;
+    }
+
+    throw new Error(
+        `Invalid model ID value, expected one of ${value.join('/')}, got ${registerValue}`,
+    );
+}

src/sunspec/helpers/sitePhases.ts

@@ -3,27 +3,23 @@ import type { InverterModel } from '../models/inverter';
 import { type MeterModel } from '../models/meter';
 
 export function getSitePhasesFromMeter(meter: MeterModel): SitePhases {
-    if (meter.ID === 201) {
-        return 'singlePhase';
+    switch (meter.ID) {
+        case 201:
+            return 'singlePhase';
+        case 202:
+            return 'splitPhase';
+        case 203:
+            return 'threePhase';
     }
-    if (meter.ID === 202) {
-        return 'splitPhase';
-    }
-    if (meter.ID === 203) {
-        return 'threePhase';
-    }
-    throw new Error(`Unknown meter SunSpec model ID ${meter.ID}`);
 }
 
 export function getSitePhasesFromInverter(inverter: InverterModel): SitePhases {
-    if (inverter.ID === 101) {
-        return 'singlePhase';
-    }
-    if (inverter.ID === 102) {
-        return 'splitPhase';
-    }
-    if (inverter.ID === 103) {
-        return 'threePhase';
+    switch (inverter.ID) {
+        case 101:
+            return 'singlePhase';
+        case 102:
+            return 'splitPhase';
+        case 103:
+            return 'threePhase';
     }
-    throw new Error(`Unknown inverter SunSpec model ID ${inverter.ID}`);
 }

src/sunspec/models/common.ts

@@ -1,4 +1,5 @@
 import {
+    registersToId,
     registersToString,
     registersToStringNullable,
     registersToUint16,
@@ -9,7 +10,7 @@ import { sunSpecModelFactory } from './sunSpecModelFactory';
 // https://sunspec.org/wp-content/uploads/2021/12/SunSpec_Information_Model_Reference_20211209.xlsx
 export type CommonModel = {
     // Length of sunspec model common (1)
-    ID: number;
+    ID: 1;
     // Length of sunspec model common (1)
     L: number;
     // Manufacturer
@@ -32,7 +33,7 @@ export const commonModel = sunSpecModelFactory<CommonModel>({
         ID: {
             start: 0,
             end: 1,
-            readConverter: registersToUint16,
+            readConverter: (value) => registersToId(value, 1),
         },
         L: {
             start: 1,

src/sunspec/models/controls.ts

@@ -9,14 +9,14 @@ import {
     registersToInt16Nullable,
     int16NullableToRegisters,
     registersToSunssfNullable,
+    registersToId,
 } from '../helpers/converters';
 import { sunSpecModelFactory } from './sunSpecModelFactory';
 
 // https://sunspec.org/wp-content/uploads/2021/12/SunSpec_Information_Model_Reference_20211209.xlsx
 export type ControlsModel = {
     // Model identifier
-    // 123 is Immediate Inverter Controls
-    ID: number;
+    ID: 123;
     // Model length
     L: number;
     // Time window for connect/disconnect
@@ -103,7 +103,7 @@ export const controlsModel = sunSpecModelFactory<
         ID: {
             start: 0,
             end: 1,
-            readConverter: registersToUint16,
+            readConverter: (value) => registersToId(value, 123),
         },
         L: {
             start: 1,

src/sunspec/models/inverter.ts

@@ -8,6 +8,7 @@ import {
     registersToInt16Nullable,
     registersToSunssfNullable,
     registersToUint32Nullable,
+    registersToId,
 } from '../helpers/converters';
 import { sunSpecModelFactory } from './sunSpecModelFactory';
 
@@ -16,7 +17,7 @@ export type InverterModel = {
     // Model identifier
     // Well-known value. Uniquely identifies this as a sunspec model inverter monitoring
     // 101 is single phase, 102 is split phase, 103 is three phase
-    ID: number;
+    ID: 101 | 102 | 103;
     // Model length
     L: number;
     // AC Current
@@ -101,7 +102,7 @@ export const inverterModel = sunSpecModelFactory<InverterModel>({
         ID: {
             start: 0,
             end: 1,
-            readConverter: registersToUint16,
+            readConverter: (value) => registersToId(value, [101, 102, 103]),
         },
         L: {
             start: 1,

src/sunspec/models/meter.ts

@@ -5,14 +5,15 @@ import {
     registersToInt16Nullable,
     registersToSunssfNullable,
     registersToAcc32,
+    registersToId,
 } from '../helpers/converters';
 import { sunSpecModelFactory } from './sunSpecModelFactory';
 
 // https://sunspec.org/wp-content/uploads/2021/12/SunSpec_Information_Model_Reference_20211209.xlsx
 export type MeterModel = {
     // Model identifier
     // 201: single phase, 202: split phase, 203: three phases
-    ID: number;
+    ID: 201 | 202 | 203;
     // Model length
     L: number;
     // AC Current
@@ -157,7 +158,7 @@ export const meterModel = sunSpecModelFactory<MeterModel>({
         ID: {
             start: 0,
             end: 1,
-            readConverter: registersToUint16,
+            readConverter: (value) => registersToId(value, [201, 202, 203]),
         },
         L: {
             start: 1,

src/sunspec/models/nameplate.ts

@@ -5,15 +5,15 @@ import {
     registersToUint16Nullable,
     registersToSunssfNullable,
     registersToInt16Nullable,
+    registersToId,
 } from '../helpers/converters';
 import { sunSpecModelFactory } from './sunSpecModelFactory';
 
 // https://sunspec.org/wp-content/uploads/2021/12/SunSpec_Information_Model_Reference_20211209.xlsx
 export type NameplateModel = {
     // Model identifier
     // Well-known value. Uniquely identifies this as a sunspec model nameplate
-    // 120 is nameplate
-    ID: number;
+    ID: 120;
     // Model length
     L: number;
     // Type of DER device. Default value is 4 to indicate PV device.
@@ -74,7 +74,7 @@ export const nameplateModel = sunSpecModelFactory<NameplateModel>({
         ID: {
             start: 0,
             end: 1,
-            readConverter: registersToUint16,
+            readConverter: (value) => registersToId(value, 120),
         },
         L: {
             start: 1,

src/sunspec/models/settings.ts

@@ -1,4 +1,5 @@
 import {
+    registersToId,
     registersToInt16,
     registersToInt16Nullable,
     registersToSunssf,
@@ -10,11 +11,9 @@ import { sunSpecModelFactory } from './sunSpecModelFactory';
 
 // https://sunspec.org/wp-content/uploads/2021/12/SunSpec_Information_Model_Reference_20211209.xlsx
 export type SettingsModel = {
-    // Address Offset
     // Model identifier
     // Well-known value. Uniquely identifies this as a sunspec model nameplate
-    // 121 is inverter controls basic settings
-    ID: number;
+    ID: 121;
     // Model length
     L: number;
     // Setting for maximum power output. Default to WRtg.
@@ -85,7 +84,7 @@ export const settingsModel = sunSpecModelFactory<SettingsModel>({
         ID: {
             start: 0,
             end: 1,
-            readConverter: registersToUint16,
+            readConverter: (value) => registersToId(value, 121),
         },
         L: {
             start: 1,

src/sunspec/models/status.ts

@@ -6,14 +6,14 @@ import {
     registersToUint32Nullable,
     registersToStringNullable,
     registersToInt16Nullable,
+    registersToId,
 } from '../helpers/converters';
 import { sunSpecModelFactory } from './sunSpecModelFactory';
 
 // https://sunspec.org/wp-content/uploads/2021/12/SunSpec_Information_Model_Reference_20211209.xlsx
 export type StatusModel = {
     // Model identifier
-    // 122 is Inverter Controls Extended Measurements and Status
-    ID: number;
+    ID: 122;
     // Model length
     L: number;
     // PV inverter present/available status. Enumerated value.
@@ -64,7 +64,7 @@ export const statusModel = sunSpecModelFactory<StatusModel>({
         ID: {
             start: 0,
             end: 1,
-            readConverter: registersToUint16,
+            readConverter: (value) => registersToId(value, 122),
         },
         L: {
             start: 1,