BUR-68 убрал лишний код. Нашел причину неотлавливаемго экспешена.

app/src/handlers/edge5-modbus-v3.ts

@@ -89,7 +89,12 @@ async function postMetrics(metrics: Edge5ModbusV3Metric[]): Promise<void> {
         throw new Error(text || `${response.status} ${response.statusText}`)
       }
 
-      void postDemoCloudIngest(metric); // для демо-системы
+      const demoResponse = await postDemoCloudIngest(metric); // для демо-системы
+
+      if (!demoResponse.ok) {
+        const text = await demoResponse.text()
+        throw new Error(text || `${demoResponse.status} ${demoResponse.statusText}`)
+      }
 
     } catch (error) {
       const message = error instanceof Error ? error.message : String(error)

app/src/index.ts

@@ -1,4 +1,3 @@
-import './process-errors.js'
 import './handlers/index.js'
 import './http/server.js'
 import './mqtt.js'

app/src/process-errors.ts

@@ -1,57 +0,0 @@
-type ErrorWithCause = Error & {
-  cause?: unknown
-}
-
-type NodeError = Error & {
-  code?: string
-  address?: string
-  port?: number
-}
-
-// Undici кладёт системную ошибку соединения внутрь error.cause.
-function getFetchCause(error: unknown): NodeError | null {
-  if (!(error instanceof Error)) {
-    return null
-  }
-
-  const cause = (error as ErrorWithCause).cause
-  return cause instanceof Error ? (cause as NodeError) : null
-}
-
-// Обрабатываем только подсвеченный кейс: backend отказал в TCP-соединении.
-function isFetchConnectionRefused(error: unknown): boolean {
-  if (!(error instanceof Error)) {
-    return false
-  }
-
-  const cause = getFetchCause(error)
-  return error.message === 'fetch failed' && cause?.code === 'ECONNREFUSED'
-}
-
-// Логируем короткую диагностическую форму без огромного stack trace.
-function formatFetchError(error: unknown): object {
-  if (!(error instanceof Error)) {
-    return { message: String(error) }
-  }
-
-  const cause = getFetchCause(error)
-  return {
-    message: error.message,
-    cause: cause?.message,
-    code: cause?.code,
-    address: cause?.address,
-    port: cause?.port,
-  }
-}
-
-// Последний рубеж защиты для fire-and-forget fetch-запросов.
-// Если backend недоступен, Node.js 22 может превратить незахваченный
-// fetch failed / ECONNREFUSED в падение всего процесса mqtt-worker.
-process.on('unhandledRejection', (error) => {
-  if (isFetchConnectionRefused(error)) {
-    console.error('process.unhandled_fetch_refused', formatFetchError(error))
-    return
-  }
-
-  console.error('process.unhandled_rejection', error)
-})

app/src/router.ts

@@ -1,19 +1,51 @@
 import { resolveHandler } from './registry.js'
 
+type ErrorWithCause = Error & {
+  cause?: unknown
+}
+
+type NodeError = Error & {
+  code?: string
+  address?: string
+  port?: number
+}
+
+function getErrorCause(error: Error): NodeError | null {
+  const cause = (error as ErrorWithCause).cause
+  return cause instanceof Error ? (cause as NodeError) : null
+}
+
+function formatHandlerError(error: unknown): object {
+  if (!(error instanceof Error)) {
+    return { message: String(error) }
+  }
+
+  const cause = getErrorCause(error)
+
+  return {
+    message: error.message,
+    cause: cause?.message,
+    code: cause?.code,
+    address: cause?.address,
+    port: cause?.port,
+    stack: error.stack,
+  }
+}
+
 export async function routeMessage(
   topic: string,
   payload: Buffer,
 ): Promise<void> {
-  const handler = resolveHandler(topic)
-
-  if (!handler) {
-    console.warn('mqtt.unhandled_topic', { topic })
-    return
-  }
-
   try {
+    const handler = resolveHandler(topic)
+
+    if (!handler) {
+      console.warn('mqtt.unhandled_topic', { topic })
+      return
+    }
+
     await handler(topic, payload)
   } catch (err) {
-    console.error('mqtt.handler_error', { topic, err })
+    console.error('mqtt.handler_error', { topic, error: formatHandlerError(err) })
   }
 }