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IIoT Libraries SL, the Perfect Package for IIoT Communication The IIoT Libraries product contains numerous libraries for supporting various communication protocols, e.g. MQTT and HTTPS, and includes tools for coding and decoding data structures, such as JSON and XML. In addition, libraries with POUs are provided for direct communication with cloud services of individual providers (AWS, Azure, etc.).The components included in the CODESYS package are ideal for communication in the IIoT environment. Libraries for Communication Web ClientThe CODESYS software package contains a library of function blocks for communication with a Webserver via HTTP or HTTPS:The GET HTTP method requests data from a Webserver.The HTTP methods POST and PUT transmit data from the controller to a Webserver.With DELETE, data is deleted from a Webserver.The HTTP method HEAD returns the HTTP header.The HTTP header of a request can be extended without restrictions. Function blocks for basic HTTP authentication and authentication via OAuth (versions 1a and 2) are also included. MQTT ClientMQTT (Message Queuing Telemetry Transport) is an open-source IoT protocol that allows telemetry data to be transmitted as messages between devices. Device communication is always performed via an MQTT broker, e.g., Eclipse Mosquitto. Messages are sent and subscribed to based on topics. A topic corresponds to a path, e.g., device1/temperature. Subscriptions to messages are made by specifying a topic filter. Wildcards are also permitted (+ for one level and # for multiple levels). The message format is not specified, i.e. a JSON string or any data structure can be transferred.The MQTT client library can be used to send messages from a CODESYS controller to an MQTT broker, and messages can be subscribed based on topics. Mail ServiceThis library contains function blocks for sending, receiving and deleting emails using the SMTP and POP3 protocols. Communication with the mail server can be either encrypted (TLS) or unencrypted. A sample project demonstrates how to use the function blocks. SMS ServiceWith this library, it is possible to send, receive and delete short messages via a GSM modem. SNMP ServiceThis library makes it possible to read device information from printers, routers, etc. via the SNMP protocol. The library offers function blocks for sending and receiving SNMP messages. The package contains the SNMP library and sample applications. Supported SNMP functions:SNMP GET: Query a value.SNMP GET_NEXT: Query a value and retrieve the OID of the next value.SNMP agent: Allows devices to request values from the controller (agent).SNMP TRAP: Send and receive TRAP/INFORM telegrams.SNMP SET: Set values via SNMP. The SNMP Service SL.package contains the following components:SNMPServiceSL (Namespace: SNMP)Project with sample applicationsCHM helpProduct data sheetSNTP Service The SNTP Service library contains function blocks for easy implementation of SNTP client and server components on a CODESYS controller (SNTP V3, SNTP V4). The SNTPGetUTCTime function block can be used to query the UTC time of an SNTP/NTP server. The SNTPServer function block can be used to set up a simple SNTP server.Function blocks (FBs) of the SNTP library:SNTPGetUTCTime: FB for querying the time of an SNTP server (SNTP client)SNTPServer: FB for sending the local server time (SNTP server) AWS IoT Core ClientAWS IoT Core Service is a managed cloud platform from Amazon in which connected devices can work easily and securely with cloud applications and other devices. The AWS IoT Core Client library provides function blocks for sending and receiving messages. Communication is encrypted and is performed via the MQTT protocol. In the AES environment, the messages are typically transmitted in JSON format. The “JSON Utilities” library can be used to parse and create JSON files. Azure IoT Hub ClientMicrosoft’s Azure IoT Hub cloud service connects IoT devices directly to each other. For more information, see IoT Hub I Microsoft Azure. The Azure IoT Hub client library provides function blocks for sending and receiving messages. A sample project shows how the library can be used. JSON Web TokenThe JSON Web Token library contains a function block for creating a JWT (JSON Web Token) on the controller. The HS256, HS384, HS512 and RS256 algorithms are supported. The JSON Web Token package contains the following components:IEC 61131-3 Library JSON Web Token SL (namespace JWT)Example project JSON Web Token SL Example.projectProgramming reference as integrated CHM helpProduct data sheet (German and English) Libraries for reading and writing data structures CSV UtilityThe CSV Utility library offers function blocks for reading and writing CSV files. The library contains the CSVReader (reading a CSV file) and CSVWriter (writing a CSV file) function blocks. All function blocks can be used in a conventional or object-oriented way. An example project demonstrates the use of all function blocks. INI File UtilityThe product INI File Utility is a library for reading and writing INI files. The library contains function blocks for reading, writing and finding values from INI files. An example project shows how to use the library and its function blocks. Contents of the package:INI File Utility SL library (Namespace: INI_UTIL)Sample project with visualization for reading, writing and searching values in INI filesCHM help file JSON UtilitiesThe JSON Utilities library offers the following functionalities:Reading JSON files (UTF-8 and UTF-16)Reading JSON byte arraysWriting JSON files (UTF-8 and UTF-16)Reading JSON byte arraysSearch for keys, values and subordinate and parent elements The data is stored in an array of structures. Data access and element search are performed using methods from the JSONData function block. A JSON file can be easily created using the JSONBuilder function block. The JSONByteArrayReader and JSONFileReader function blocks read data in JSON format and save the values in the JSONData function block. Files and byte arrays are written using the JSONFileWriter and JSONByteArrayWriter function blocks. A simple REST client can be easily implemented in conjunction with the “Web Client” library. XML UtilityThe XML Utility library contains function blocks for reading and writing XML files or XML strings on a controller. All elements of the XML file are stored in an array of structures. The library also contains function blocks to search for elements by name and attributes. Two sample applications demonstrate how to use the library. The library contains the following components:IEC 61131-3 Library XML Utility SL (Namespace XML)Example project XML Utility SL Example.projectIntegrated CHM programming referenceProduct data sheet (de and en) ctrlX, ctrlX Automation and ctrlX OS are registered trademarks of Bosch Rexroth AG.CODESYS® is a registered trademark of CODESYS GmbH.