VisiLogic V350 request current weather by API

[Anton]

Hi all!

I need current weather and forecast in my project on Vision V350
I have read good example for Unistream https://support.unitronics.com/index.php?/selfhelp/view-article/unistream-rest-api-example
But it not applicable for VisiLogic, because I can't find and Rest API function and any other samples with receiving weather data from site.

Please advise how can I  connect V350 to accuweather site? 
or may be available another way for receiving weather data from internet?

 

[DanT]

Hi;

 

Rest API  is a functon in the  UniStream Series only.

V700  is a Vision Series PLC,  older than the UniStream Series, and does not have/support  the Rest API  Function 

   Vision Series is based on another  OS technology - Microcontroller and Fixed Structure.

You may have to resort to an intermediate solution - Raspberry PI( for example)  to get the weather data, then Modbus the infomation into the V700

 

DanT

[Flex727]

18 minutes ago, DanT said:

You may have to resort to an intermediate solution - Raspberry PI( for example)  to get the weather data, then Modbus the infomation into the V700

What I have done when I must use a Vision PLC but need certain communications protocols not available in the vision line is use a UniStream USC-B3-R20 and communicate the information to the Vision PLC via MODBUS TCP, as Dan is suggesting. It's a little more expensive than a Raspberry Pi, but if you already know how to program the UniStream then it's really convenient. It will just sit on the DIN Rail alongside other components and works like a champ.

[Fernando Castro]

Isn't the rest API just a request over http protocol? the authorization is done in the server, right? I mean if that is the case in theory you should be able to do it using. TCP/IP protocol.

and hard coding the headers of the messages, and the responses ... I mean I don't think it will be worth the time if there is already an easier solution available but seems doable to me.

 

 

[Anton]

Thanks for the responses guys,

Additional devices is a real solution, but not applicable for this project.
I want to try resolve this problem by V350 function

2 hours ago, Fernando Castro said:

theory you should be able to do it using. TCP/IP protocol.

I am also think about it, but not have experience of TCP/IP communication by Visio. May be you have some samples?
 

[Fernando Castro]

23 hours ago, Anton said:

Thanks for the responses guys,

Additional devices is a real solution, but not applicable for this project.
I want to try resolve this problem by V350 function

I am also think about it, but not have experience of TCP/IP communication by Visio. May be you have some samples?
 

Not really, there is something you could take a look at in the examples folder. I started to implement an FTP client by myself but was very tedious job and never finished.

I managed to get the responses from the FTP protocol as ASCII values then, list files on the server and start the download but got stuck buffering the file and then writing it to the SD card.

basically, with TCP/IP you initialize a socket through a specific port, then connect to It and then and then you can use TCP/IP raw to build the messages.

If you are going to try it will help to Install a program like Wireshark to monitor the messages sent over the network, and debug what is being sent/received.

As I mentioned before, it will be time consuming