Arduino core for CMWX1ZZABZ-078-based LoRaWAN devices

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I program the software provided by ST on Cubeide.

Yup, this is likely one of the problems…

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How should I go about it?

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Surest way is to redesign your custom board to conform to the Grasshopper design and use the grasshopper Arduino core. The ST CubeMX software is not design for ultra-low power, ironically enough.

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Thank you for helping.There must be a solution, I will try

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I have some code that works, but I have to press the “RST” button on the board every time for it to work properly. (to start transmitting data). Is there a way to do this in the code as a startup procedure? Or is there some other issue I need to address?
Thanks

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Which hardware are you using? If this is a Grasshopper pressing the reset shouldn’t be necessary for LoRaWAN Tx; I don’t even understand how this could work. If you are using the Grasshopper Arduino core you could try STM32L0.reset(); or something like this (check the core for the exact syntax).

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Its the Grasshopper board, but yeah not sure why this works, just tried it on a whim. I will have to try out your suggestion, will check the core for syntax. Thanks

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hi.I use Quectel (L86) brand gps in hardware.I put the GPS and lora to sleep for 1 hour and wake them up and send the coordinates.When I look at the GPS data, I see a deviation of 100 ~ 500 meters.sometimes deviation doesn’t happen that much.Have you encountered such a problem in the u-blox family?

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The quality of GNSS fix depends on a lot of things like sky view, antenna size, container, etc. Usually with open skies, an 18 mm x 18 mm active patch antenna and a plastic container (how I do my Ublox M8Q testing) I see accuracy of ~2 meters with the occasional outlier, sometimes as much as ~25 m. I use EPE to determine when the fix is good enough to manage power and often set the threshold at EPE < 30 and occasionally EPE < 10. I don’t think I have ever seen errors as large as 500 m. I would say 95% of the readings are < 2 m.

You can verify this for yourself using this or this.

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I am using a patch antenna 18.4 x 18.4 mm.I guess it happens when waking up from standby.I am thinking of testing with the neo 6m.Thanks for your help