From 55c45412e0b6eec51d55b663ac5dd561be3a0e08 Mon Sep 17 00:00:00 2001
From: root <root@v2202607378382480008.hotsrv.de>
Date: Tue, 21 Jul 2026 11:07:35 +0200
Subject: [PATCH] fix: preserve UART backend for read plans

---
 tools/hwpod-harness.test.ts    | 2 ++
 tools/src/hwpod-harness-lib.ts | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/hwpod-harness.test.ts b/tools/hwpod-harness.test.ts
index b400c420..cf8df463 100644
--- a/tools/hwpod-harness.test.ts
+++ b/tools/hwpod-harness.test.ts
@@ -275,6 +275,8 @@ test("hwpod-cli dry-run invokes hwpod-compiler-cli and exposes hwpod-node-ops pl
       "--spec",
       specPath
     ], { now: () => NOW });
+    const pyserialRead = await runHwpodCli(["uart", "read", "--spec", specPath, "--port", "uart1", "--dry-run"], { now: () => NOW });
+    assert.equal(pyserialRead.payload.plan.ops[0].args.uartBackend, "pyserial");
     const uartOpen = await runHwpodCli(["uart", "open", "--spec", specPath, "--port", "uart1", "--dry-run"], { now: () => NOW });
     assert.equal(uartOpen.payload.plan.ops[0].op, "io.uart.open");
     assert.equal(uartOpen.payload.plan.ops[0].args.port, "COM9");
diff --git a/tools/src/hwpod-harness-lib.ts b/tools/src/hwpod-harness-lib.ts
index 08920d85..d9744d38 100644
--- a/tools/src/hwpod-harness-lib.ts
+++ b/tools/src/hwpod-harness-lib.ts
@@ -1018,7 +1018,7 @@ function keilJobStatusCommand(args: any, document: any) {
 
 function serialMonitorReadCommand(args: any, document: any) {
   const binding = serialMonitorBinding(args, document);
-  const { requestedPort, physicalPort, baudRate, serialMonitorDir, commandBase, timeoutMs } = binding;
+  const { requestedPort, backend, physicalPort, baudRate, serialMonitorDir, commandBase, timeoutMs } = binding;
   const limit = Math.max(1, Math.min(numberValue(args.limit) ?? Math.ceil((numberValue(args.maxBytes) ?? 4096) / 80), 200));
   const fetchArgs = ["fetch", "-l", String(limit), ...(args.sessionOnly === true ? ["--session-only"] : []), ...(text(args.since) ? ["-s", text(args.since)] : [])];
   const sequenceRun = jsonCliSequenceCommandRun([
@@ -1026,6 +1026,7 @@ function serialMonitorReadCommand(args: any, document: any) {
     [...commandBase, ...fetchArgs]
   ]);
   return {
+    backend,
     physicalPort,
     baudRate,
     serialMonitorDir,