From 895439b01beb2e14a2d3a44981b116bd44b3e473 Mon Sep 17 00:00:00 2001
From: Dhanya Thattil <dhanya.thattil@psi.ch>
Date: Fri, 8 May 2026 11:08:01 +0200
Subject: [PATCH] fix test, check port position for detector type

---
 slsReceiverSoftware/src/ClientInterface.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/slsReceiverSoftware/src/ClientInterface.cpp b/slsReceiverSoftware/src/ClientInterface.cpp
index 82a55e07b..2b43c617f 100644
--- a/slsReceiverSoftware/src/ClientInterface.cpp
+++ b/slsReceiverSoftware/src/ClientInterface.cpp
@@ -1683,6 +1683,9 @@ int ClientInterface::set_port_udp_datastream(Interface &socket) {
     portPosition port = static_cast<portPosition>(args[0]);
     validate_port_position(port);
     bool enable = static_cast<bool>(args[1]);
+    if (impl()->getNumberofUDPInterfaces() == 1)
+        throw RuntimeError("Cannot change UDP port datastream with only 1 "
+                           "interface enabled. Hint: set 'numinterfaces' to 2");
     LOG(logDEBUG1) << "Setting udp datastream (" << ToString(port) << ") to "
                    << ToString(enable);
     verifyIdle(socket);