diff --git a/app/src/handlers/demo-plc.ts b/app/src/handlers/demo-plc.ts
index 91b9fed..4e7fd06 100644
--- a/app/src/handlers/demo-plc.ts
+++ b/app/src/handlers/demo-plc.ts
@@ -28,7 +28,7 @@ function toMetric(payload: DemoPlcPayload, timestamp: number): DemoPlcMetric {
 }
 
 async function postMetric(metric: DemoPlcMetric): Promise<void> {
-  const response = await postCloudIngest([metric])
+  const response = await postCloudIngest(metric)
 
   if (!response.ok) {
     const text = await response.text()
diff --git a/app/src/handlers/edge5-modbus-v2.ts b/app/src/handlers/edge5-modbus-v2.ts
index 7c09ab5..8c8335e 100644
--- a/app/src/handlers/edge5-modbus-v2.ts
+++ b/app/src/handlers/edge5-modbus-v2.ts
@@ -22,14 +22,32 @@ function assertRegisterCount(values: number[]): void {
 }
 
 async function postMetrics(metrics: MappedMetric[]): Promise<void> {
-  const response = await postCloudIngest(metrics)
+  const errors: Error[] = []
 
-  if (!response.ok) {
-    const text = await response.text()
-    throw new Error(text)
+  for (const metric of metrics) {
+    try {
+      const response = await postCloudIngest(metric)
+
+      if (!response.ok) {
+        const text = await response.text()
+        throw new Error(text || `${response.status} ${response.statusText}`)
+      }
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error)
+      errors.push(new Error(`${metric.tag}: ${message}`))
+      console.error('edge5.modbus.v2.metric.failed', metric.tag, message)
+    }
   }
 
-  console.log('edge5.modbus.v2.posted', { count: metrics.length })
+  console.log('edge5.modbus.v2.posted', {
+    total: metrics.length,
+    succeeded: metrics.length - errors.length,
+    failed: errors.length,
+  })
+
+  if (errors.length) {
+    throw new Error(`Failed to post ${errors.length}/${metrics.length} edge5 modbus v2 metrics`)
+  }
 }
 
 export const handleEdge5ModbusV2: TopicHandler = async (topic, payload) => {
diff --git a/app/src/handlers/edge5-modbus.ts b/app/src/handlers/edge5-modbus.ts
index 59cfefd..94abe24 100644
--- a/app/src/handlers/edge5-modbus.ts
+++ b/app/src/handlers/edge5-modbus.ts
@@ -35,11 +35,13 @@ function toMetrics(values: number[], timestamp: number): Edge5ModbusMetric[] {
 }
 
 async function postMetrics(metrics: Edge5ModbusMetric[]): Promise<void> {
-  const response = await postCloudIngest(metrics)
+  for (const metric of metrics) {
+    const response = await postCloudIngest(metric)
 
-  if (!response.ok) {
-    const text = await response.text()
-    throw new Error(text)
+    if (!response.ok) {
+      const text = await response.text()
+      throw new Error(text)
+    }
   }
 
   console.log('edge5.modbus.posted', { count: metrics.length })