# Can Ignition Edge MQTT connect to a ICONICS HMI system via MQTT **URL:** \ **Category:** Ignition\ **Created:** [July 22, 2020, 4:55pm UTC](https://forum.inductiveautomation.com/t/can-ignition-edge-mqtt-connect-to-a-iconics-hmi-system-via-mqtt/36953 "2020-07-22T16:55:48Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![mjohnson](https://avatars.discourse-cdn.com/v4/letter/m/a9a28c/32.png) [@mjohnson](https://forum.inductiveautomation.com/u/mjohnson)\ **Post date:** [July 22, 2020, 4:55pm UTC](https://forum.inductiveautomation.com/t/can-ignition-edge-mqtt-connect-to-a-iconics-hmi-system-via-mqtt/36953/1 "2020-07-22T16:55:48Z")
It looks like sparkplug is not compatible with the form of JSON ICONICS likes. I was wondering if anyone else has run into this issue? Solved: On e solution is to set MQTT Transmission to AWS greengrass. ICONICS does not like Sparkplug. Thanks. ---
**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\ **Post date:** [July 22, 2020, 8:57pm UTC](https://forum.inductiveautomation.com/t/can-ignition-edge-mqtt-connect-to-a-iconics-hmi-system-via-mqtt/36953/2 "2020-07-22T20:57:13Z")
You can also create a custom namespace and use a pure JSON string setup without any specification. ---
**Author:** ![mjohnson](https://avatars.discourse-cdn.com/v4/letter/m/a9a28c/32.png) [@mjohnson](https://forum.inductiveautomation.com/u/mjohnson)\ **Post date:** [July 24, 2020, 5:19pm UTC](https://forum.inductiveautomation.com/t/can-ignition-edge-mqtt-connect-to-a-iconics-hmi-system-via-mqtt/36953/3 "2020-07-24T17:19:57Z")
I tried that at first and it did not appear to work for ICONICS. For this to work does not ICONICS have to send out a request for a topic rather just listening for topics?