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Aaron Tsede
Aaron Tsede
Visitor II
June 12, 2017
Question

Send LoRa packet with AT command - b-l072z-lrwan1

Posted on June 12, 2017 at 15:37

Hello,

I am trying to use LoRa connectivity with the brand new b-l072z-lrwan1 discovery board. The End Node project works perfectly but I have an issue with the AT Slave project. When I try to send LoRa packet to my Multitech gateway, this one never receive the packet and I cannot use AT command with the disco board anymore. I can only do a hardware reset of the board. 

As you can see on my screenshot, the Join process has been done correctly. After the AT+SEND command I never receive a status like OK or AT ERROR.

Are you able to help me ?

Thank you !

Aaron

#b-l072z-lrwan1 #at_slave #lora
This topic has been closed for replies.

13 replies

Rob Rodriguez
Rob Rodriguez
Visitor II
August 14, 2017
Posted on August 15, 2017 at 00:03

I am having this same issue. It appears to be related to the tiny_sscanf, but I can't seem to figure out why?

Tesla DeLorean
Tesla DeLorean
Guru
August 14, 2017
Posted on August 15, 2017 at 01:54

Try rebuilding the firmware using the v1.1.1 release of the LRWAN software

http://www.st.com/en/embedded-software/i-cube-lrwan.html

 
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Danny Chow
Danny Chow
Visitor II
August 15, 2017
Posted on August 15, 2017 at 12:12

I have exactly the same problem in the AT_Slave software that I built.

I was using LRWAN software v1.1.1. I only added the 'REGION_US915' compiler switch without modifying anything of the code.

If I use the binary provided in this thread: 

https://community.st.com/community/stm32-community/blog/2017/04/05/lora-discovery-kit

 

(

LoraDisco_ATSlave_US915.hex),

I can send data without this stopping issue.

Any way to solve it?

Tesla DeLorean
Tesla DeLorean
Guru
August 15, 2017
Posted on August 15, 2017 at 16:02

Here is a quick build of AT_Slave V1.1.1 US915

________________

Attachments :

LoraDisco_ATSlave_US915_V111.hex.zip : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HySN&d=%2Fa%2F0X0000000b8n%2F88fmzhPFPd725.0hxoa27SXLpVu4ox7Wlsn2VuExdjU&asPdf=false
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Danny Chow
Danny Chow
Visitor II
August 16, 2017
Posted on August 16, 2017 at 04:21

Thanks Clive One. Your build works for me. I can send the data and receive response.

But I also need to figure out our cause as we need to customize the firmware and build ourselves.

Rob Rodriguez
Rob Rodriguez
Visitor II
August 16, 2017
Posted on August 16, 2017 at 04:33

Like others have posted we need customization, we also use US_915_HYBRID and require channel masks (hence our custom build). 

Tesla DeLorean
Tesla DeLorean
Guru
August 17, 2017
Posted on August 17, 2017 at 01:25

If the stock build doesn't work you should perhaps focus on that first.

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Rob Rodriguez
Rob Rodriguez
Visitor II
August 17, 2017
Posted on August 17, 2017 at 01:35

I used the provided project and the recommended eclipse based tools. It builds just fine. Just send doesn't work. It hangs in tiny_sscanf. I worked around it and doing my own build with my own tool chain that is now working fine.

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