Teltonika RUT24x MQTT broker bridge, make client certificate and key optional

rut24x.patch

diff -Nausr a/package/mosquitto/files/mosquitto.init b/package/mosquitto/files/mosquitto.init
--- a/package/mosquitto/files/mosquitto.init	2021-01-21 19:12:55.101811434 +0200
+++ b/package/mosquitto/files/mosquitto.init	2021-01-21 19:49:43.649268961 +0200
@@ -111,8 +111,14 @@
 		# Use TLS/SSL for bridge connection
 		if [ "$use_remote_tls" == "1" ]; then
 			echo "bridge_cafile $bridge_ca_file" >> $CONFIG
-			echo "bridge_certfile $bridge_cert_file" >> $CONFIG
-			echo "bridge_keyfile $bridge_key_file" >> $CONFIG
+			if [ -n "$bridge_cert_file" ]
+			then
+				echo "bridge_certfile $bridge_cert_file" >> $CONFIG
+			fi
+			if [ -n "$bridge_key_file" ]
+			then
+				echo "bridge_keyfile $bridge_key_file" >> $CONFIG
+			fi
 			echo "bridge_tls_version $bridge_tls_version" >> $CONFIG
 			if [ "$bridge_insecure" = "1" ]
 			then
diff -Nausr a/package/mosquitto/files/mosquitto_old.init b/package/mosquitto/files/mosquitto_old.init
--- a/package/mosquitto/files/mosquitto_old.init	2021-01-21 19:12:55.105811512 +0200
+++ b/package/mosquitto/files/mosquitto_old.init	2021-01-21 19:50:56.072097759 +0200
@@ -67,8 +67,14 @@
 		# Use TLS/SSL for bridge connection
 		if [ "$use_remote_tls" == "1" ]; then
 			echo "bridge_cafile $bridge_ca_file" >> $CONFIG
-			echo "bridge_certfile $bridge_cert_file" >> $CONFIG
-			echo "bridge_keyfile $bridge_key_file" >> $CONFIG		
+			if [ -n "$bridge_cert_file" ]
+			then
+				echo "bridge_certfile $bridge_cert_file" >> $CONFIG
+			fi
+			if [ -n "$bridge_key_file" ]
+			then
+				echo "bridge_keyfile $bridge_key_file" >> $CONFIG
+			fi
 		fi
 		
 		# Use remote login