data transmission issue about thingsboard-client-sdk

[MathewHDYT]

The return method does not block while the package is being sent. So the boolean only shows where the data could be initally sent with the MqttClient.

But it is configured to be "Fire-and-Forget", meaning we do not resend or get informed about lost packages. This is mainly because that is not how MQTT is meant to work. MQTT is mainly meant for small data values that are sent often, meaning resending lost packets would cause a needless overhead.

If you want to adjust that you would need to change the TBPubSubClient, simply go into the installed library and search for retained and set all occurences of it to true as the default value when passing the argument.

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Additionally -95 is incredibly bad, meaning even if the above options is enabled it could be likely, that the sends are still not successfull. Mainly because the internet connection is not stable enough to actually transmit the data to the mqtt broker successfully.

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Besides the aforementioned issue this is not something that can be fixed in the library, so either attempt to integrate the above fix and see if it helps at all and if not the only other way is to increase your WiFi connection or in the best case use a Lan cable, which is much more reliable.

[vijayflashbulb]

Thank you @MathewHDYT for your reply.
yes i have also observed that everything works fine on wifi but cellular connection gives problems.