USe SlapOS's SR.

coupler/opc-ua-server/coupler1.sh

 #!/bin/bash
-./server -m 1 -b 1 -i 1 -l 2,3 -t 100 -o 10000
+COUPLER_SR=/opt/slapgrid/f552116ea7549aa455a9739e3c361a25
+$COUPLER_SR/bin/server -m 1 -b 1 -i 1 -l 2,3 -t 100 -o 10000

coupler/opc-ua-server/coupler2.sh

 #!/bin/bash
-./server -p 4841 -m 1 -b 1 -i 2 -l 1,3 -t 100 -o 10000
+COUPLER_SR=/opt/slapgrid/f552116ea7549aa455a9739e3c361a25
+$COUPLER_SR/bin/server -p 4841 -m 1 -b 1 -i 2 -l 1,3 -t 100 -o 10000

coupler/opc-ua-server/coupler3.sh

 #!/bin/bash
-./server -p 4842 -m 1 -b 1 -i 3 -l 1,2 -t 100 -o 10000
+COUPLER_SR=/opt/slapgrid/f552116ea7549aa455a9739e3c361a25
+$COUPLER_SR/bin/server -p 4842 -m 1 -b 1 -i 3 -l 1,2 -t 100 -o 10000