IT & Business

4-x relay board C0135 managed by Modbus RTU protocol (RS-485)

To test a device management by Modbus RTU commands, we use the circuitry of 4 relays controlled by the STM8S103 controller. (Relay MCU 4-way relay-communication board (RS-485). Manage the relay  To turn a relay on/off we will use Modbus “Write Single Coil … Continue reading

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Inexpensive Modbus RTU to Modbus TCP Elfin EW-11 Wi-Fi converter (RS485)

Modbus RTU (RS485 interface) to Modbus TCP converters from the top producers like Moxa, Advantech, Schneider, ABB and etc. are quite expensive. Of course, the quality and reliability of these industrial devices are really very high. Sometimes the most important parameter … Continue reading

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Azure IoT Solutions. Stopping/starting Azure IoT related services to cut costs.

After installing Azure IoT Solutions (free trial) in a couple days you’ll realize that IoT related services permanently consume your money and there is no easy way (the one button) how to manage this. Money just dries up. But, it’s … Continue reading

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BigBlueButton .NET (C#) SDK

BigBlueButton is an quite interesting open source web conferencing system for on-line learning. BigBlueButton enables to share documents (PDF and any office document), webcams, chat, audio and sharing desktop. It can also record sessions for later playback. It helps to deploy webinars or … Continue reading

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Error “Unable to connect to the remote server” connecting to a WebService under IIS

I’d developed small web application using C# and ASP.NET. To simplify developing I used some public web service. So, ASP.NET application invokes methods from external (public) web service. I’d created Web Reference to the web service  http://api.morpher.ru/WebService.asmx. While I’d developed ASP.NET application locally (using IIS … Continue reading

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How to get OTRS agents list from .NET application

Unfortunately, I coudn’t find OTRS web service method to reterieve list of OTRS agents: user name and IDs. I create forum topics on the official forum to solve the task. I found some workaround. It’s not so fast as I would like, … Continue reading

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How to connect .NET application to OTRS web service

Since the official WSDL file had published on GitHub doesn’t work with .NET applications, I try to found how to fix its. Thanks to Andrey Antipov who helps me found some mistakes and colleagues from OTRS forum. Connection from .NET application to OTRS web … Continue reading

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