Inclusion of custom server bind address

The custom opcua server bind option is added and it can be
parced with command line option -a or server_ip_address=.
If no ip address is mentioned, then server is listening on all interfaces

modified:   cli.h
modified:   keep_alive_publisher.h
modified:   keep_alive_subscriber.h
modified:   server.c

Test: Program is tested

coupler/opc-ua-server/cli.h

@@ -7,6 +7,7 @@ static char doc[] = "OPC-UA server which controls MOD-IO's relays' state over OP
 static char args_doc[] = "...";
 static struct argp_option options[] = {
   {"port",        'p', "4840", 0, "Port to bind to."},
+  {"server-ip-address",     'a', "", 0, "Server address to bind to."},
   {"device",      'd', "/dev/i2c-1", 0, "Linux block device path."},
   {"slave-address-list", 's', "0x58", 0, "Comma separated list of slave I2C addresses."},
   {"mode",        'm', "0", 0, "Set different modes of operation of coupler. Default (0) is set attached \
@@ -30,6 +31,7 @@ struct arguments
 {
     int mode;
     int port;
+    char *server_ip_address;
     char *device;
     char *slave_address_list;
     char *username;
@@ -51,6 +53,9 @@ static error_t parse_opt(int key, char *arg, struct argp_state *state)
     case 'p':
       arguments->port = arg ? atoi (arg) : DEFAULT_OPC_UA_PORT;
       break;
+    case 'a':
+      arguments->server_ip_address = arg;
+      break;
     case 'd':
       arguments->device = arg;
       break;
@@ -110,6 +115,7 @@ void handleCLI(int argc, char **argv) {
 
     struct arguments arguments;
     arguments.port = DEFAULT_OPC_UA_PORT;
+    arguments.server_ip_address = "";
     arguments.mode = DEFAULT_MODE;
     arguments.device = DEFAULT_I2C_BLOCK_DEVICE_NAME;
     arguments.slave_address_list = DEFAULT_I2C_0_ADDR;
@@ -126,6 +132,7 @@ void handleCLI(int argc, char **argv) {
 
     printf("Mode=%d\n", arguments.mode);
     printf("Listening port=%d\n", arguments.port);
+    printf("server_ip_address=%s\n", arguments.server_ip_address);
     printf("Block device=%s\n", arguments.device);
     printf("Slave address list=%s\n", arguments.slave_address_list);
     printf("Key=%s\n", arguments.key);
@@ -147,6 +154,7 @@ void handleCLI(int argc, char **argv) {
     USERNAME = arguments.username;
     PASSWORD = arguments.password;
     OPC_UA_PORT = arguments.port;
+    OPC_UA_ADDRESS = arguments.server_ip_address;
     ENABLE_X509 = strlen(arguments.key) > 0 && strlen(arguments.certificate);
     ENABLE_USERNAME_PASSWORD_AUTHENTICATION = strlen(arguments.username) > 0 && strlen(arguments.password) > 0;
     ENABLE_HEART_BEAT = arguments.heart_beat;

coupler/opc-ua-server/keep_alive_publisher.h

@@ -19,7 +19,7 @@ static void addPubSubConnection(UA_Server *server, UA_String *transportProfile,
                          &UA_TYPES[UA_TYPES_NETWORKADDRESSURLDATATYPE]);
     /* Changed to static publisherId from random generation to identify
      * the publisher on Subscriber side */
-    connectionConfig.publisherId.numeric = PUBLISHER_ID;
+    connectionConfig.publisherId.uint32 = PUBLISHER_ID;
     UA_Server_addPubSubConnection(server, &connectionConfig, &connectionIdent);
 }
 

coupler/opc-ua-server/keep_alive_subscriber.h

@@ -72,7 +72,7 @@ static UA_StatusCode addPubSubConnectionSubscriber(UA_Server *server, UA_String
     connectionConfig.enabled = UA_TRUE;
     UA_Variant_setScalar(&connectionConfig.address, networkAddressUrl,
                          &UA_TYPES[UA_TYPES_NETWORKADDRESSURLDATATYPE]);
-    connectionConfig.publisherId.numeric = UA_UInt32_random ();
+    connectionConfig.publisherId.uint32 = UA_UInt32_random ();
     retval |= UA_Server_addPubSubConnection (server, &connectionConfig, &connectionIdentifier);
     if (retval != UA_STATUSCODE_GOOD) {
         return retval;

coupler/opc-ua-server/server.c

@@ -48,6 +48,7 @@ const int DEFAULT_MODE = 0;
 const int DEFAULT_COUPLER_ID = 0;
 
 int OPC_UA_PORT;
+char *OPC_UA_ADDRESS;
 bool ENABLE_HEART_BEAT = false;
 bool ENABLE_HEART_BEAT_CHECK = false;
 bool ENABLE_X509 = false;
@@ -85,10 +86,37 @@ int main(int argc, char **argv)
 
   signal(SIGINT, stopHandler);
   signal(SIGTERM, stopHandler);
+  UA_String serverUrls[1];
+  size_t serverUrlsSize = 0;
+  char serverUrlBuffer[1][512];
 
   server = UA_Server_new();
   UA_ServerConfig_setMinimal(UA_Server_getConfig(server), OPC_UA_PORT, NULL);
   UA_ServerConfig *config = UA_Server_getConfig(server);
+  
+  // opc_ua server is listening to user input address else on all interfaces
+  // user input ip address should be added to any of the interface else no server socket will be created
+  if(OPC_UA_ADDRESS!= NULL){
+    // check whether the default url is already set
+    if(config->serverUrlsSize > 0) {
+      UA_LOG_WARNING(&config->logger, UA_LOGCATEGORY_USERLAND, "ServerUrls already set. Overriding.");
+      UA_Array_delete(config->serverUrls, config->serverUrlsSize, &UA_TYPES[UA_TYPES_STRING]);
+      config->serverUrls = NULL;
+      config->serverUrlsSize = 0;
+    }
+
+    // construct opc_ua server url based on input ip address
+    UA_snprintf(serverUrlBuffer[0], sizeof(serverUrlBuffer[0]), "opc.tcp://%s:%u", OPC_UA_ADDRESS, OPC_UA_PORT);
+    serverUrls[serverUrlsSize] = UA_STRING(serverUrlBuffer[0]);
+    serverUrlsSize++;
+    
+    // add the url into the config
+    UA_StatusCode ret_val = UA_Array_copy(serverUrls, serverUrlsSize, (void**)&config->serverUrls, &UA_TYPES[UA_TYPES_STRING]);
+    if(ret_val != UA_STATUSCODE_GOOD){
+      return ret_val;
+    }
+    config->serverUrlsSize = serverUrlsSize;
+  }
   config->verifyRequestTimestamp = UA_RULEHANDLING_ACCEPT;
 
   // add variables representing physical relays / inputs, etc