mirror of
https://github.com/open62541/open62541.git
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Moritz Bruder
e41e2ca79d
Add UA_Client_newFromFile() and UA_ClientConfig_loadFromFile() to create and configure a client from a JSON5 configuration file.
86 lines
3.2 KiB
C
86 lines
3.2 KiB
C
/* This work is licensed under a Creative Commons CCZero 1.0 Universal License.
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* See http://creativecommons.org/publicdomain/zero/1.0/ for more information. */
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#include <open62541/client.h>
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#include <open62541/client_highlevel.h>
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#include <open62541/client_config_default.h>
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#include <open62541/plugin/log_stdout.h>
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#include <stdlib.h>
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#include "common.h"
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int main(int argc, char** argv) {
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UA_ByteString json_config = UA_BYTESTRING_NULL;
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if(argc >= 2) {
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/* Load client config */
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json_config = loadFile(argv[1]);
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if (UA_String_isEmpty(&json_config)) {
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UA_LOG_FATAL(UA_Log_Stdout, UA_LOGCATEGORY_APPLICATION,
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"Failed to load the client configuration from file '%s'.",
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argv[1]);
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return EXIT_FAILURE;
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}
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} else {
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UA_LOG_FATAL(UA_Log_Stdout, UA_LOGCATEGORY_APPLICATION,
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"Missing argument. Argument are "
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"<client-config.json5>");
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return EXIT_FAILURE;
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}
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/*
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* Create the client directly from the JSON file. Alternatively, the configuration
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* can be loaded into a UA_ClientConfig and then used to create the client. The
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* following is identical to the line below:
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*
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* UA_ClientConfig clientConfig;
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* UA_StatusCode res = UA_ClientConfig_loadFromFile(&clientConfig, json_config);
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* UA_Client *client = UA_Client_new(&clientConfig);
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*
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*/
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UA_Client *client = UA_Client_newFromFile(json_config);
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/* identical to first steps example */
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UA_StatusCode retval = UA_Client_connect(client, "opc.tcp://localhost:4840");
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if(retval != UA_STATUSCODE_GOOD) {
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UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_APPLICATION,
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"The connection failed with status code %s",
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UA_StatusCode_name(retval));
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UA_Client_delete(client);
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UA_ByteString_clear(&json_config);
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return 0;
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}
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/* Read the value attribute of the node. UA_Client_readValueAttribute is a
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* wrapper for the raw read service available as UA_Client_Service_read. */
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UA_Variant value;
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UA_Variant_init(&value);
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/* NodeId of the variable holding the current time */
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const UA_NodeId nodeId = UA_NS0ID(SERVER_SERVERSTATUS_CURRENTTIME);
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retval = UA_Client_readValueAttribute(client, nodeId, &value);
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if(retval == UA_STATUSCODE_GOOD &&
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UA_Variant_hasScalarType(&value, &UA_TYPES[UA_TYPES_DATETIME])) {
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UA_DateTime raw_date = *(UA_DateTime *) value.data;
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UA_DateTimeStruct dts = UA_DateTime_toStruct(raw_date);
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UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_APPLICATION,
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"date is: %u-%u-%u %u:%u:%u.%03u",
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dts.day, dts.month, dts.year, dts.hour,
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dts.min, dts.sec, dts.milliSec);
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} else {
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UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_APPLICATION,
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"Reading the value failed with status code %s",
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UA_StatusCode_name(retval));
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}
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/* Clean up */
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UA_Variant_clear(&value);
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UA_Client_delete(client); /* Disconnects the client internally */
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/* clean up */
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UA_ByteString_clear(&json_config);
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return retval == UA_STATUSCODE_GOOD ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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