Use SlapOS's open62541's shared library (same one against which coupler

was built against) and not system wide one in /usr/local/lib which
was the case recently.

slapos/software/osie-coupler/buildout.hash.cfg

@@ -6,4 +6,4 @@ filename = instance-opc-ua.cfg.in
 md5sum = 542fca1e0708b70229a700965e1db989
 
 filename = instance-opc-ua-virtual.cfg.in
-md5sum = 05e6b318b47cb2a7da8c54a6f65bc7cd
+md5sum = d10c8e58066b944058489b1b59b2bb53

slapos/software/osie-coupler/instance-opc-ua-virtual.cfg.in

@@ -16,6 +16,8 @@ extends = {{ template_monitor }}
 
 [coupler-opc-ua]
 recipe = slapos.cookbook:wrapper
+environment =
+  LD_LIBRARY_PATH=$LD_LIBRARY_PATH:{{ open62541_location }}/lib
 command-line =
     {{ buildout['bin-directory'] }}/server -d ${instance-parameter:configuration.coupler_block_device} -s ${instance-parameter:configuration.coupler_i2c_slave_list} -m 1 -p ${instance-parameter:configuration.opc_ua_port} -u ${instance-parameter:configuration.username} -w ${instance-parameter:configuration.password} -b ${instance-parameter:configuration.heart_beat} -t ${instance-parameter:configuration.heart_beat_interval} -l ${instance-parameter:configuration.heart_beat_id_list} -n ${instance-parameter:configuration.network_address_url_data_type} -o ${instance-parameter:configuration.heart_beat_timeout_interval} -i ${instance-parameter:configuration.id}
 

slapos/software/osie-coupler/software-opc-ua-virtual.cfg

@@ -14,5 +14,6 @@ extensions = jinja2.ext.do
 context =
   section buildout  buildout
   raw template_monitor ${monitor2-template:output}
+  key open62541_location open62541:location
 # md5sum is fetched from buildout.hash.cfg and can be recalculated automatically by
 # calling update-hash