# Cumulocity Interface Issue

**URL:** <https://community.cumulocity.com/t/cumulocity-interface-issue/4063>\
**Category:** Forum\
**Tags:** device-connectivity, cumulocity\
**Created:** [November 18, 2021, 2:03pm UTC](https://community.cumulocity.com/t/cumulocity-interface-issue/4063 "2021-11-18T14:03:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![pushkar3](https://avatars.discourse-cdn.com/v4/letter/p/f1d935/32.png) [@pushkar3](https://community.cumulocity.com/u/pushkar3)\
**Post date:** [November 18, 2021, 2:03pm UTC](https://community.cumulocity.com/t/cumulocity-interface-issue/4063/1 "2021-11-18T14:03:37Z")

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#### What product/components do you use and which version/fix level?

Cumulocity IoT, Raspberry Pi (Raspbian GNU/Linux 10) ,VFD (Modbus RTU to USB), python 2.7.16,MQTT

#### What are trying to achieve? Please describe in detail.

I am trying to interfacing Cumulocity IoT with VFD using Modbus RTU(RS485) to USB converter connected to Raspberry Pi and trying to send data over MQTT broker. Cannot able to communicate Raspberry Pi with Cumulocity showing send connection offline ,Push connection active and I am facing error while sending data to MQTT

#### Do you get any error messages? Please provide a **full error** message screenshot and log file.

 ![image](https://europe1.discourse-cdn.com/flex005/uploads/cumulocity/original/3X/b/2/b29b0fcc4bd704443868457980749af2047988f2.png) -Communication Error

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**Author:** ![Christian\_Guether1](https://dub1.discourse-cdn.com/flex005/user_avatar/community.cumulocity.com/christian_guether1/32/14848_2.png) [@Christian\_Guether1](https://community.cumulocity.com/u/Christian_Guether1)\
**Post date:** [November 18, 2021, 2:53pm UTC](https://community.cumulocity.com/t/cumulocity-interface-issue/4063/2 "2021-11-18T14:53:54Z")

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Hi Pushkar,

what Cumulocity agent did you install on your Raspberry Pi or did you implement an agent yourself?

Best regards  
Christian

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**Author:** ![system](https://dub1.discourse-cdn.com/flex005/user_avatar/community.cumulocity.com/system/32/31990_2.png) [@system](https://community.cumulocity.com/u/system)\
**Post date:** [February 16, 2022, 2:54pm UTC](https://community.cumulocity.com/t/cumulocity-interface-issue/4063/3 "2022-02-16T14:54:27Z")

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Closed on February 16, 2022, 2:54pm UTC

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