Enable binding to a custom hostname / IPV4 address for OPC UA server.

coupler/cli.h

@@ -37,9 +37,7 @@ static char doc[] = "rPLC coupler OPC UA server.";
 static char args_doc[] = "...";
 static struct argp_option options[] = {
   {"port",                  'p', "4840",       0, "Port to bind to.", 0},
-  /*
-  {"server-ip-address",     'a', "",           0, "[not yet available] Server address to bind to.", 0},
-  */
+  {"server-ip-address",     'a', "",           0, "Server address to bind to.", 0},
   {"device",                'd', "/dev/i2c-1", 0, "Linux' I2C bus device path.", 0},
   {"slave-address-list",    's', "0x58",       0, "Comma separated list of slave I2C addresses.", 0},
   {"mode",                  'm', "0",          0, "Set different modes of operation of coupler. Default (0) is set attached I2C's state state. Virtual (1) which does NOT set any I2C slaves' state.", 0},

coupler/server.c

@@ -126,10 +126,18 @@ int main(int argc, char **argv)
   signal(SIGTERM, stopHandler);
 
   server = UA_Server_new();
+  UA_ServerConfig *config = UA_Server_getConfig(server);
+
+  // set hostname
+  if (OPC_UA_ADDRESS) {
+    UA_String customServerUrls = UA_STRING(OPC_UA_ADDRESS);
+    config->customHostname = customServerUrls;
+  }
+
   if (!ENABLE_X509){
-    UA_ServerConfig_setMinimal(UA_Server_getConfig(server), OPC_UA_PORT, NULL);
+    UA_ServerConfig_setMinimal(config, OPC_UA_PORT, NULL);
   }
-  UA_ServerConfig *config = UA_Server_getConfig(server);
+
   config->verifyRequestTimestamp = UA_RULEHANDLING_ACCEPT;
 
   // add variables representing physical relays / inputs, etc