gnu: libmodbus: Update to 3.1.11.

* gnu/packages/engineering.scm (libmodbus): Update to 3.1.11.  Add a missing
newline after the package definition.
[source]: Add a patch which disables a test that requires networking.
* gnu/packages/patches/libmodbus-disable-networking-test.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

Change-Id: I657c0aac3435ec20da6e15d31484effdb7c2dc0b

3 files changed, 45 insertions, 4 deletions

diff --git a/gnu/local.mk b/gnu/local.mk
index cd29329c8fb..c1ef6fab183 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -49,7 +49,7 @@
 # Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
 # Copyright © 2022 Daniel Meißner <daniel.meissner-i4k@ruhr-uni-bochum.de>
 # Copyright © 2022, 2024 Remco van 't Veer <remco@remworks.net>
-# Copyright © 2022, 2024 Artyom V. Poptsov <poptsov.artyom@gmail.com>
+# Copyright © 2022, 2024, 2025 Artyom V. Poptsov <poptsov.artyom@gmail.com>
 # Copyright © 2022, 2023 John Kehayias <john.kehayias@protonmail.com>
 # Copyright © 2022 muradm <mail@muradm.net>
 # Copyright © 2022 Hilton Chain <hako@ultrarare.space>
@@ -1843,6 +1843,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/mcrypt-CVE-2012-4527.patch                       \
   %D%/packages/patches/libmemcached-build-with-gcc7.patch       \
   %D%/packages/patches/libmhash-hmac-fix-uaf.patch              \
+  %D%/packages/patches/libmodbus-disable-networking-test.patch \
   %D%/packages/patches/lib-tl-for-telegram-memcpy.patch \
   %D%/packages/patches/llama-cpp-vulkan-optional.patch  \
   %D%/packages/patches/llhttp-ponyfill-object-fromentries.patch \
diff --git a/gnu/packages/engineering.scm b/gnu/packages/engineering.scm
index f3bcf77c797..8b6bd85293e 100644
--- a/gnu/packages/engineering.scm
+++ b/gnu/packages/engineering.scm
@@ -1733,7 +1733,7 @@ send break and throttle transmission speed.")
 (define-public libmodbus
   (package
     (name "libmodbus")
-    (version "3.1.10")
+    (version "3.1.11")
     (source (origin
               (method git-fetch)
               (uri (git-reference
@@ -1742,15 +1742,20 @@ send break and throttle transmission speed.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "0nbpk1n56kclab8fl32dxi46v2bwax3gfk1zkc796srm7vj42sbv"))))
+                "15rqrzamlp6cvixz6klnawlc9s3w34bapc1fs2c4amwyvi3n5xvp"))
+              ;; The patch removes a test that requires networking.
+              ;; See <https://github.com/stephane/libmodbus/issues/802>
+              (patches
+               (search-patches "libmodbus-disable-networking-test.patch"))))
     (build-system gnu-build-system)
-    (native-inputs (list autoconf automake libtool))
+    (native-inputs (list autoconf psmisc automake libtool))
     (synopsis "Library for the Modbus protocol")
     (description "@code{libmodbus} is a library to send/receive data with a
 device which respects the Modbus protocol.  This library can use a serial port
 or an Ethernet connection.")
     (home-page "https://libmodbus.org/")
     (license license:lgpl2.1+)))
+
 (define-public harminv
   (package
     (name "harminv")
diff --git a/gnu/packages/patches/libmodbus-disable-networking-test.patch b/gnu/packages/patches/libmodbus-disable-networking-test.patch
new file mode 100644
index 00000000000..045390cbbd8
--- /dev/null
+++ b/gnu/packages/patches/libmodbus-disable-networking-test.patch
@@ -0,0 +1,35 @@
+From 4fc47d8711650a1385bea0652e522af2c85129bc Mon Sep 17 00:00:00 2001
+From: "Artyom V. Poptsov" <poptsov.artyom@gmail.com>
+Date: Sun, 23 Mar 2025 09:44:34 +0300
+Subject: [PATCH] tests/unit-test-client: Disable a test requiring networking
+
+* tests/unit-test-client.c (main): Disable the test that requires networking
+as it fails with "Network is unreachable" (errno: 101) in environments where
+networking is not available (e.g. GNU Guix.) See
+<https://github.com/stephane/libmodbus/issues/802>.
+---
+ tests/unit-test-client.c | 8 --------
+ 1 file changed, 8 deletions(-)
+
+diff --git a/tests/unit-test-client.c b/tests/unit-test-client.c
+index a1813b1..58eaf5f 100644
+--- a/tests/unit-test-client.c
++++ b/tests/unit-test-client.c
+@@ -671,14 +671,6 @@ int main(int argc, char *argv[])
+     printf("7/8 Disable byte timeout: ");
+     ASSERT_TRUE(rc == 1, "");
+ 
+-    // Invalid in TCP or RTU mode...
+-    modbus_t *invalid_ctx = modbus_new_tcp("1.2.3.4", 1502);
+-    modbus_set_response_timeout(ctx, 0, 1);
+-    rc = modbus_connect(invalid_ctx);
+-    printf("8/8 Connection timeout: ");
+-    ASSERT_TRUE(rc == -1 && errno == ETIMEDOUT, "");
+-    modbus_free(invalid_ctx);
+-
+     /* Restore original response timeout */
+     modbus_set_response_timeout(ctx, old_response_to_sec, old_response_to_usec);
+ 
+-- 
+2.48.1
+