libmodbus: add support for the libmodbus development release

libmodbus has two release streams:
- stable: which currently is 3.0.x and does only receive fixes
- development: 3.1.x which receives new features and according to upstream is also very stable

Some users require access to the newer features.
So a recipe for the development branch but leave the stable branch the default.
This is similar to what is done for the nginx recipe which also has two release streams.

Signed-off-by: Pascal Bach <pascal.bach@siemens.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-extended/libmodbus/libmodbus.inc

@@ -0,0 +1,13 @@
+SUMMARY = "A Modbus library"
+DESCRIPTION = "libmodbus is a C library designed to provide a fast and robust \
+implementation of the Modbus protocol. It runs on Linux, Mac OS X, FreeBSD, \
+QNX and Windows."
+HOMEPAGE = "http://www.libmodbus.org/"
+SECTION = "libs"
+
+LICENSE = "LGPLv2.1+"
+LIC_FILES_CHKSUM = "file://COPYING.LESSER;md5=4fbd65380cdd255951079008b364516c"
+
+SRC_URI = "http://libmodbus.org/releases/${BP}.tar.gz"
+
+inherit autotools pkgconfig

meta-oe/recipes-extended/libmodbus/libmodbus_3.0.6.bb

@@ -1,16 +1,4 @@
-SUMMARY = "A Modbus library"
+require libmodbus.inc
-DESCRIPTION = "libmodbus is a C library designed to provide a fast and robust \
-implementation of the Modbus protocol. It runs on Linux, Mac OS X, FreeBSD, \
-QNX and Windows."
-HOMEPAGE = "http://www.libmodbus.org/"
-SECTION = "libs"
-
-LICENSE = "LGPLv2.1+"
-LIC_FILES_CHKSUM = "file://COPYING.LESSER;md5=4fbd65380cdd255951079008b364516c"
-
-SRC_URI = "http://libmodbus.org/site_media/build/${BP}.tar.gz"
-
-inherit autotools pkgconfig
 
 SRC_URI[md5sum] = "c80f88b6ca19cabc4ceffc195ca07771"
 SRC_URI[sha256sum] = "046d63f10f755e2160dc56ef681e5f5ad3862a57c1955fd82e0ce036b69471b6"

meta-oe/recipes-extended/libmodbus/libmodbus_3.1.2.bb

@@ -0,0 +1,7 @@
+require libmodbus.inc
+
+# Use the stable branch by default
+DEFAULT_PREFERENCE = "-1"
+
+SRC_URI[md5sum] = "dd4262f87ed835c4d1e560f8321a222c"
+SRC_URI[sha256sum] = "661e14f9dc904f3f1b034464ddaa5fd4b8472f8f5d1ea10a1148af85591b7ee9"