# Forum **URL:** https://community.cumulocity.com/c/forum/5.md [Latest](https://community.cumulocity.com/latest.md) · [Categories](https://community.cumulocity.com/categories.md) · [Tags](https://community.cumulocity.com/tags.md) --- ## [IoT Forum rules & General Posting guidelines](https://community.cumulocity.com/t/iot-forum-rules-general-posting-guidelines/2665)
**Author:** [@Stefan\_Witschel](https://community.cumulocity.com/u/Stefan_Witschel)\ **Replies:** 0\ **Last updated:** [August 29, 2023, 1:05pm UTC](https://community.cumulocity.com/t/iot-forum-rules-general-posting-guidelines/2665 "2023-08-29T13:05:54Z")
Purpose Purpose of this article is to define common forum rules and provide posting guidelines in the IoT group so topics can be answered fast and efficiently. Let’s start with some common rules 1. Common rules 1.1 B… --- ## [About the Forum category](https://community.cumulocity.com/t/about-the-forum-category/12)
**Author:** [@Stefan\_Witschel](https://community.cumulocity.com/u/Stefan_Witschel)\ **Replies:** 0\ **Last updated:** [September 26, 2024, 1:14pm UTC](https://community.cumulocity.com/t/about-the-forum-category/12 "2024-09-26T13:14:02Z")
Ask a question, search for answers, brainstorm solutions, or start a discussion. --- ## [Bulk import via CSV - Device management templates](https://community.cumulocity.com/t/bulk-import-via-csv-device-management-templates/15131)
**Author:** [@bdm](https://community.cumulocity.com/u/bdm)\ **Replies:** 1\ **Last updated:** [October 25, 2026, 9:39pm UTC](https://community.cumulocity.com/t/bulk-import-via-csv-device-management-templates/15131 "2026-10-25T21:39:00Z")
Hello, we would like to understand more what we are seeing: sometimes we see created for example 40 and successful 43, what does it mean? what could be the remaining 3? is it some already existing devices which were u… --- ## [Dynamic Mapper REST-API GET "polling"](https://community.cumulocity.com/t/dynamic-mapper-rest-api-get-polling/15204)
**Author:** [@v.reschke](https://community.cumulocity.com/u/v.reschke)\ **Replies:** 6\ **Last updated:** [October 2, 2026, 12:25pm UTC](https://community.cumulocity.com/t/dynamic-mapper-rest-api-get-polling/15204 "2026-10-02T12:25:52Z")
Hi everyone, I’m currently trying to use the Dynamic Mapper to periodically poll data from an external REST API and map it as e.g. measurements into Cumulocity. trigger (e.g. 5min) – \> REST GET (Extr. API) – \> Mappin… --- ## [\[Notification 2.0\] org.svenson.JSONParser - Property 'webSocketOnly' will be ignored](https://community.cumulocity.com/t/notification-2-0-org-svenson-jsonparser-property-websocketonly-will-be-ignored/15221)
**Author:** [@attila.katona](https://community.cumulocity.com/u/attila.katona)\ **Replies:** 1\ **Last updated:** [October 2, 2026, 7:29am UTC](https://community.cumulocity.com/t/notification-2-0-org-svenson-jsonparser-property-websocketonly-will-be-ignored/15221 "2026-10-02T07:29:19Z")
Hi, We have been facing an issue while using Notification 2.0 API based on Cumulocity version 2026.22.0. The error was that the measurement subscriptions suddenly stopped to work and in the Microservice logs running on… --- ## [Asset Type Dashboards?](https://community.cumulocity.com/t/asset-type-dashboards/15220)
**Author:** [@ChristophRose](https://community.cumulocity.com/u/ChristophRose)\ **Replies:** 2\ **Last updated:** [September 30, 2026, 11:48am UTC](https://community.cumulocity.com/t/asset-type-dashboards/15220 "2026-09-30T11:48:19Z")
I might be blind or misunderstanding something, so I’ll just ask the “dumb” question: I’m used to having device type dashboards, where I can create dashboards and they are then automatically applied to all devices of th… --- ## [A/B environments](https://community.cumulocity.com/t/a-b-environments/15201)
**Author:** [@david.presuhn](https://community.cumulocity.com/u/david.presuhn)\ **Replies:** 2\ **Last updated:** [September 18, 2026, 1:07pm UTC](https://community.cumulocity.com/t/a-b-environments/15201 "2026-09-18T13:07:10Z")
I have a user who wants 2 production tenancies. They want to do Design Validation in Environment A and then at some point make that Production and switch the Production Environment (environment B) to a Staging environmen… --- ## [Enhancement request- enable multiple subtenancies to utilize same trust store](https://community.cumulocity.com/t/enhancement-request-enable-multiple-subtenancies-to-utilize-same-trust-store/15200)
**Author:** [@david.presuhn](https://community.cumulocity.com/u/david.presuhn)\ **Replies:** 1\ **Last updated:** [September 17, 2026, 3:44pm UTC](https://community.cumulocity.com/t/enhancement-request-enable-multiple-subtenancies-to-utilize-same-trust-store/15200 "2026-09-17T15:44:51Z")
We use certificates for mutual authentication and have several non-production sub-tenancies, such as Sandbox and test environments. We would like to transfer devices between the two environments but using the same certi… --- ## [Device Name set to MQTT\_DeviceId](https://community.cumulocity.com/t/device-name-set-to-mqtt-deviceid/15159)
**Author:** [@vsingh17](https://community.cumulocity.com/u/vsingh17)\ **Replies:** 4\ **Last updated:** [September 1, 2026, 3:32pm UTC](https://community.cumulocity.com/t/device-name-set-to-mqtt-deviceid/15159 "2026-09-01T15:32:58Z")
Hello, I’m connecting a device using thin-edge and have noticed some inconsistent behavior: the device name is sometimes set to “DeviceId” and other times to “MQTT\_DeviceId”. I’d like to understand how to make this dete… --- ## [Changing Mailserver Authentication from Basic Auth to OAuth 2.0](https://community.cumulocity.com/t/changing-mailserver-authentication-from-basic-auth-to-oauth-2-0/15140)
**Author:** [@v.reschke](https://community.cumulocity.com/u/v.reschke)\ **Replies:** 2\ **Last updated:** [August 27, 2026, 11:08am UTC](https://community.cumulocity.com/t/changing-mailserver-authentication-from-basic-auth-to-oauth-2-0/15140 "2026-08-27T11:08:17Z")
Hi everyone, I’m currently trying updating our mail configuration and was hoping some of you might have already gone through the same process. The Problem is in our Cumulocity environment, we are currently still using … --- ## [External ID addition as a custom field in device management](https://community.cumulocity.com/t/external-id-addition-as-a-custom-field-in-device-management/15130)
**Author:** [@bdm](https://community.cumulocity.com/u/bdm)\ **Replies:** 1\ **Last updated:** [August 24, 2026, 7:29pm UTC](https://community.cumulocity.com/t/external-id-addition-as-a-custom-field-in-device-management/15130 "2026-08-24T19:29:37Z")
Hello, as you can see in the example below, this device has an external ID additionally to its internal ID: what should be configured if we want to add it as a new column? and are we allowed to add it? or we can onl… --- ## [Apama Cumulocity Connection Concurrency](https://community.cumulocity.com/t/apama-cumulocity-connection-concurrency/15105)
**Author:** [@Mario\_Heidenreich2](https://community.cumulocity.com/u/Mario_Heidenreich2)\ **Replies:** 3\ **Last updated:** [August 20, 2026, 9:26am UTC](https://community.cumulocity.com/t/apama-cumulocity-connection-concurrency/15105 "2026-08-20T09:26:04Z")
Hi all, I’m trying to optimize a bunch of custom EPL code running with the Cumulocity Connectivity and I want to optimize the inbound/outbound handling. I had a look at the doc but it’s not clear for me what this means: … --- ## [How to inspect Notification 2.0 topics and consumers on Cumulocity Edge?](https://community.cumulocity.com/t/how-to-inspect-notification-2-0-topics-and-consumers-on-cumulocity-edge/15107)
**Author:** [@wojciech.najdek](https://community.cumulocity.com/u/wojciech.najdek)\ **Replies:** 2\ **Last updated:** [August 19, 2026, 7:44am UTC](https://community.cumulocity.com/t/how-to-inspect-notification-2-0-topics-and-consumers-on-cumulocity-edge/15107 "2026-08-19T07:44:15Z")
Hi, I’m using Cumulocity Edge 2025 with Notifications 2.0 and I’m trying to understand the state of the Messaging Service on my Edge instance. Specifically, I’d like to know: How can I see which consumers exist for a… --- ## [Share your best Widget](https://community.cumulocity.com/t/share-your-best-widget/14396)
**Author:** [@Jan\_Hommes](https://community.cumulocity.com/u/Jan_Hommes)\ **Replies:** 6\ **Last updated:** [July 31, 2026, 6:30am UTC](https://community.cumulocity.com/t/share-your-best-widget/14396 "2026-07-31T06:30:43Z")
With the new HTML Widget it was never easier to build useful widgets, especially if you are using the AI Coding Assistant from the AI Agent Manager (now public preview :tada:). However, not everyone can enable the AI Age… --- ## [Request for Guidance on Seamless User Authentication Migration to own identity/authentication system](https://community.cumulocity.com/t/request-for-guidance-on-seamless-user-authentication-migration-to-own-identity-authentication-system/15038)
**Author:** [@brkngcn](https://community.cumulocity.com/u/brkngcn)\ **Replies:** 3\ **Last updated:** [July 21, 2026, 8:14am UTC](https://community.cumulocity.com/t/request-for-guidance-on-seamless-user-authentication-migration-to-own-identity-authentication-system/15038 "2026-07-21T08:14:37Z")
Hello Cumulocity Support Team and Forum people; We are planning to use our own identity/authentication system for user login. Our main goal is to make this migration as seamless as possible for end users. In particular… --- ## [Remote-Access Passthrough error "No Auth information found"](https://community.cumulocity.com/t/remote-access-passthrough-error-no-auth-information-found/15009)
**Author:** [@v.reschke](https://community.cumulocity.com/u/v.reschke)\ **Replies:** 13\ **Last updated:** [July 17, 2026, 11:51am UTC](https://community.cumulocity.com/t/remote-access-passthrough-error-no-auth-information-found/15009 "2026-07-17T11:51:35Z")
Hi, we are trying to connect via remote access and passthrough to an address that is reachable from the device. We were able to complete the configuration in Remote Access, and the tab is now displayed as well. When w… --- ## [Retention rule ignore timestamps from 1970](https://community.cumulocity.com/t/retention-rule-ignore-timestamps-from-1970/15037)
**Author:** [@hgansmueller](https://community.cumulocity.com/u/hgansmueller)\ **Replies:** 1\ **Last updated:** [July 16, 2026, 12:36pm UTC](https://community.cumulocity.com/t/retention-rule-ignore-timestamps-from-1970/15037 "2026-07-16T12:36:10Z")
Hi all, why do retention rules ignore timestamps from measurements from 1970? I also found measurements from 2002. greets Helmut --- ## [Read-only users blocked from viewing historical telemetry in data graph widget](https://community.cumulocity.com/t/read-only-users-blocked-from-viewing-historical-telemetry-in-data-graph-widget/15017)
**Author:** [@Vignesh\_Babu](https://community.cumulocity.com/u/Vignesh_Babu)\ **Replies:** 1\ **Last updated:** [July 14, 2026, 3:40pm UTC](https://community.cumulocity.com/t/read-only-users-blocked-from-viewing-historical-telemetry-in-data-graph-widget/15017 "2026-07-14T15:40:46Z")
Hello Team, A customer is facing the below issue with the new data graph widget when high-frequency telemetry meets read-only dashboard users. Scenario: Data graph widget default to Real-time / Last Hour for high-fre… --- ## [Options to create alarm if device certificate(thin-edge) is about to expire](https://community.cumulocity.com/t/options-to-create-alarm-if-device-certificate-thin-edge-is-about-to-expire/15022)
**Author:** [@Christof\_Strack](https://community.cumulocity.com/u/Christof_Strack)\ **Replies:** 1\ **Last updated:** [July 14, 2026, 10:48am UTC](https://community.cumulocity.com/t/options-to-create-alarm-if-device-certificate-thin-edge-is-about-to-expire/15022 "2026-07-14T10:48:25Z")
Hi, What are the considerations for implementing either of these solutions for the following use case? thin-edge uses : X509 certificates, that expire after X months. Renewal window: The certificate must be renewe… --- ## [How to use processingMode in Smart Function / Dynamic Mapper](https://community.cumulocity.com/t/how-to-use-processingmode-in-smart-function-dynamic-mapper/15011)
**Author:** [@v.reschke](https://community.cumulocity.com/u/v.reschke)\ **Replies:** 2\ **Last updated:** [July 10, 2026, 9:40am UTC](https://community.cumulocity.com/t/how-to-use-processingmode-in-smart-function-dynamic-mapper/15011 "2026-07-10T09:40:01Z")
Hi everyone, I’m trying to send measurement data in Cumulocity in TRANSIENT mode via a Smart Function in the Dynamic Mapper, so that the data is processed by Streaming Analytics but no measurement is stored in the datab… --- ## [Custom widget development](https://community.cumulocity.com/t/custom-widget-development/15008)
**Author:** [@franck.arrestier](https://community.cumulocity.com/u/franck.arrestier)\ **Replies:** 4\ **Last updated:** [July 9, 2026, 8:37am UTC](https://community.cumulocity.com/t/custom-widget-development/15008 "2026-07-09T08:37:26Z")
Hello, for our internal IOT platform, we add custom widgets to the initial catalog. We created some for Cockpit 1021 version but with latest release 1023, we have some issues. After authentication, widget is not loaded… --- ## [Firmware - ZIP files - Wrong http headers](https://community.cumulocity.com/t/firmware-zip-files-wrong-http-headers/15006)
**Author:** [@Manfred.Gruber](https://community.cumulocity.com/u/Manfred.Gruber)\ **Replies:** 2\ **Last updated:** [July 7, 2026, 10:43am UTC](https://community.cumulocity.com/t/firmware-zip-files-wrong-http-headers/15006 "2026-07-07T10:43:20Z")
Hello! I have some strange behaviour on cumulocity zip files firmware handling, some folders where the firmware is, I get following correct http header when downloading them: “content-type” : “application/zip” but on s… --- ## [Error while trying firmware OTA](https://community.cumulocity.com/t/error-while-trying-firmware-ota/14612)
**Author:** [@hariss](https://community.cumulocity.com/u/hariss)\ **Replies:** 22\ **Last updated:** [July 6, 2026, 10:26am UTC](https://community.cumulocity.com/t/error-while-trying-firmware-ota/14612 "2026-07-06T10:26:53Z")
Hello, I am testing the firmware OTA operation in Cumulocity and although the procedure was working ok yesterday, today I get this error: Operation updated: status: "FAILED", failure reason: "Unexpected failure of ope… --- ## [Cost of monitor.subscribe](https://community.cumulocity.com/t/cost-of-monitor-subscribe/15003)
**Author:** [@Mario\_Heidenreich2](https://community.cumulocity.com/u/Mario_Heidenreich2)\ **Replies:** 1\ **Last updated:** [July 3, 2026, 8:19am UTC](https://community.cumulocity.com/t/cost-of-monitor-subscribe/15003 "2026-07-03T08:19:31Z")
Hi all, I know that the recommended way is to only subscribe to channels when necessary and unsubscribe when they are not needed anymore. But what is actually the overhead of a subscription? Will it copy events per sub… --- ## [How to deploy / build Cumulocity web app with public /anonymous access](https://community.cumulocity.com/t/how-to-deploy-build-cumulocity-web-app-with-public-anonymous-access/14997)
**Author:** [@Christof\_Strack](https://community.cumulocity.com/u/Christof_Strack)\ **Replies:** 3\ **Last updated:** [July 1, 2026, 5:54am UTC](https://community.cumulocity.com/t/how-to-deploy-build-cumulocity-web-app-with-public-anonymous-access/14997 "2026-07-01T05:54:59Z")
Hi, I would like to deploy an app to Cumulocity containing documentation, openapi spec for user without requiring authentication. How can I achieve this? P.S. the link found in another topic isn’t valid any longer. –… --- ## [Microservice SDK](https://community.cumulocity.com/t/microservice-sdk/14972)
**Author:** [@Lorn\_Kjewlsvar](https://community.cumulocity.com/u/Lorn_Kjewlsvar)\ **Replies:** 1\ **Last updated:** [June 24, 2026, 12:15pm UTC](https://community.cumulocity.com/t/microservice-sdk/14972 "2026-06-24T12:15:31Z")
Hello community, I did not find any post or Question concerning an upgrade from Spring Boot 3.x to 4.x. Currently the SDK still uses 3.x. The (security) updates will end with june. We currently maintain multiple microse… --- ## [MQTT-Service Connection with DynamicMapper](https://community.cumulocity.com/t/mqtt-service-connection-with-dynamicmapper/14611)
**Author:** [@v.reschke](https://community.cumulocity.com/u/v.reschke)\ **Replies:** 4\ **Last updated:** [June 3, 2026, 3:06pm UTC](https://community.cumulocity.com/t/mqtt-service-connection-with-dynamicmapper/14611 "2026-06-03T15:06:36Z")
Hi, I’m currently trying to use the “Connector MQTT Service Pulsar” with the Dynamic Mapper. When I try to enable the connection, I get the status “FAILED”. I’ve checked the microservices (Messaging-management and mq… --- ## [Download Operation with directy content (without file repository)](https://community.cumulocity.com/t/download-operation-with-directy-content-without-file-repository/14605)
**Author:** [@david.boenisch](https://community.cumulocity.com/u/david.boenisch)\ **Replies:** 2\ **Last updated:** [June 2, 2026, 7:17am UTC](https://community.cumulocity.com/t/download-operation-with-directy-content-without-file-repository/14605 "2026-06-02T07:17:28Z")
Hello everyone, I have the following question for you: Is a download operation (c8y\_DownloadConfigFile) (from the device’s perspective) only possible using a binary file from the repository? Or can I specify the conten… --- ## [What's the most efficient way to extract measurements?](https://community.cumulocity.com/t/whats-the-most-efficient-way-to-extract-measurements/14583)
**Author:** [@Christoph\_Souris](https://community.cumulocity.com/u/Christoph_Souris)\ **Replies:** 1\ **Last updated:** [May 26, 2026, 11:43am UTC](https://community.cumulocity.com/t/whats-the-most-efficient-way-to-extract-measurements/14583 "2026-05-26T11:43:40Z")
Hi all! I’m trying to understand what’s the best way to extract metrics for ad-hoc analytics, e.g. grab the values of a certain series for a month or wo. There are two endpoints: https://cumulocity.com/api/core/#oper… --- ## [Thin-edge.io and WSL](https://community.cumulocity.com/t/thin-edge-io-and-wsl/14593)
**Author:** [@Marco\_Stoffel](https://community.cumulocity.com/u/Marco_Stoffel)\ **Replies:** 1\ **Last updated:** [May 21, 2026, 9:45am UTC](https://community.cumulocity.com/t/thin-edge-io-and-wsl/14593 "2026-05-21T09:45:09Z")
Hi experts, are there any caveats / best practices for running thin-edge.io under Windows Subsystem for Linux (WSL)? Thanks Marco [Next page](https://community.cumulocity.com/c/forum/5.md?page=1)