mtk: flag FM350 as not supporting multiplexing

There is no released firmware version with proper support for
multiplexing yet.

src/plugins/meson.build

@@ -641,14 +641,18 @@ endif
 
 # plugin: mtk
 if plugins_options['mtk']
+  test_udev_rules_dir_c_args = ['-DTESTUDEVRULESDIR_MTK="@0@"'.format(plugins_dir / 'mtk')]
+  plugins_test_udev_rules_dir_c_args += test_udev_rules_dir_c_args
   sources = files(
     'mtk/mm-plugin-mtk.c',
   )
 
   plugins += {'plugin-mtk': {
     'plugin': true,
-    'module': {'sources': sources, 'include_directories': plugins_incs, 'c_args': '-DMM_MODULE_NAME="mtk"'},
+    'module': {'sources': sources, 'include_directories': plugins_incs, 'c_args': test_udev_rules_dir_c_args + ['-DMM_MODULE_NAME="mtk"']},
   }}
+
+  plugins_udev_rules += files('mtk/77-mm-mtk-port-types.rules')
 endif
 
 # plugin: nokia

src/plugins/mtk/77-mm-mtk-port-types.rules

@@ -0,0 +1,11 @@
+# do not edit this file, it will be overwritten on update
+ACTION!="add|change|move|bind", GOTO="mm_mtk_port_types_end"
+SUBSYSTEMS=="pci", SUBSYSTEM=="wwan", ATTRS{vendor}=="0x14c3", GOTO="mm_mtk_port_types"
+GOTO="mm_mtk_port_types_end"
+
+LABEL="mm_mtk_port_types"
+
+# Fibocom FM350 doesn't correctly support multiplexing yet
+ATTRS{vendor}=="0x14c3", ATTRS{device}=="0x4d75", ENV{ID_MM_MAX_MULTIPLEXED_LINKS}="0"
+
+LABEL="mm_mtk_port_types_end"