Corregir lecturas nulas de sensores EZO

api/acquisition-service.js

@@ -140,8 +140,11 @@ async function appendReading(filePath, timestamp, value) {
 
 async function publishReading(sensorId, rawValue, timestamp, mode) {
     const sensor = SENSOR_FILES[sensorId];
-    const value = Number(rawValue);
     const jsonPath = path.join(DATA_DIRECTORY, sensor.json);
+    const hasReading = rawValue !== null &&
+        rawValue !== undefined &&
+        rawValue !== '';
+    const value = hasReading ? Number(rawValue) : NaN;
 
     if (!Number.isFinite(value)) {
         await atomicWriteFile(jsonPath, `${JSON.stringify({
@@ -217,6 +220,7 @@ module.exports = {
     collectReadings,
     detectAcquisitionMode,
     publishAllOffline,
+    publishReading,
     readRuntimeConfig,
     writeRuntimeConfig
 };

test/api.test.js

@@ -16,7 +16,7 @@ process.env.RUNTIME_CONFIG_FILE = temporaryRuntime;
 process.env.EZO_MODE = 'demo';
 
 const { app, HISTORY_FILES } = require('../api/server');
-const { collectReadings } = require('../api/acquisition-service');
+const { collectReadings, publishReading } = require('../api/acquisition-service');
 
 let server;
 let baseUrl;
@@ -140,6 +140,20 @@ test('demo acquisition writes live JSON and CSV files', async () => {
     }
 });
 
+test('hardware null readings are marked offline and not appended as zero', async () => {
+    const timestamp = new Date().toISOString();
+    const csvPath = path.join(temporaryLogs, 'ph.csv');
+    fs.rmSync(csvPath, { force: true });
+
+    const online = await publishReading('ph', null, timestamp, 'hardware');
+    const data = JSON.parse(fs.readFileSync(path.join(temporaryData, 'EZOPH.json')));
+
+    assert.equal(online, false);
+    assert.equal(data.online, false);
+    assert.equal(data.error, 'Lectura no disponible');
+    assert.equal(fs.existsSync(csvPath), false);
+});
+
 test('clears historical CSV files and preserves headers', async () => {
     for (const name of Object.keys(HISTORY_FILES)) {
         fs.writeFileSync(path.join(temporaryLogs, `${name}.csv`), 'old,data\n1,2\n');