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Topic messages with payload larger than 66 bytes not received by MQTT Test Client

0

Able to send topic content with payloads up to 66 bytes that are received and displayed via the MQTT Test Client. A LoRaWAN Gateway is registered as a Thing. Messages from the gateway are published and displayed in the MQTT Test Client using the filter "#" as long as the payload is less than 66 bytes. If the payload is higher, the system log in the gateway indicates the message is forwarded just like the smaller messages but they do not show up in the MQTT Test Client. According the documentation, payloads well over 200 bytes should be possible.

Why would the published messages from the gateway to the AWS IoT not be able to send a payload larger than 66 bytes?

Topics
Internet of Things (IoT)
Tags
AWS IoT Core
Language
English
rePost-User-1839877
asked 2 years ago225 views
1 Answer
0

Hi. Maximum payload size depends on the RF region and the data rate; what region and data rate are you using? What device do you have sending messages to the gateway?

Is the uplink received in Network Analyzer and/or CloudWatch? Please try those out to get more insight into the issue. Please share your findings and perhaps also share the relevant snippet of the Basic Station log.

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EXPERT
Greg_B
answered 2 years ago
  • rePost-User-1839877
    2 years ago

    Hi Greg - thank you for your response. Sorry for the delay.

    New to AWS IoT and it is a bit overwhelming. I am using US915, DR 4. The device I registered as a device is a RAK7268 Gateway. It is not registered as a gateway at AWS, just a device. This objective is to transport up to 255 characters into AWS IoT once every couple of minutes.

    I tried the Network Analyzer but it does not see the device as a resource. I am trying CloudWatch now.

  • Greg_B EXPERT
    2 years ago

    The device I registered as a device is a RAK7268 Gateway. It is not registered as a gateway at AWS, just a device.

    OK, so you're not using AWS IoT Core for LoRaWAN? Just AWS IoT Core I think. Have you setup as described here? https://docs.rakwireless.com/Knowledge-Hub/Learn/AWS-IoT-Core-Integration/

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