I Cube LRWAN problem

Hello, I am currently working on a project using LoRa technology. My end node is composed of Nucleo-l073rz and i-Nucleo-lrwan1 shield and I am also using Keil IDE. So here’s the problem:

  1. I installed the I Cube Lrwan expansion ( I tried both V1.3.1 and the latest one which is the V2.0.0 and even older versions)
  2. I made the changes in the code as instructed (Older version : Changes in the commissioning.h file: DevEUI, JoinEUI, NwkKey, *Latest Version * : Changes in the se-identity.h file: DevEUI, JoinEUI, NwkKey)
  3. I built and loaded the code
  4. I used Tera term on my COM to monitor the join request
  5. In both cases ( for the 2 versions) I got nothing.
    5.1 for the V1.3.1 version (and all the older versions like v1.1.1, v1.2.2 v1.4.1 …): I get Phy TxTimeout and nothing else (I monitor the traffic on the gateway and I get nothing )
    5.2 for the V2.0.0 version: I keep getting Join Failed every 10 spb1
    So I am asking for a solution to this problem and Thank you in advance

Have you checked the device transmits on the frequencies the gateway uses? (Is it using the right frequency plan and for those with multiple sub-bands the right sub-band?)

Thank you for your reply,
How can I check that?
I mean even the tutorial for this is to install the I Cube LRWAN make few changes and it works fine for everyone.

The transmit frequency is visible in your output. Does that match the gateway settings?

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1 Like

Yes, the gateway has the same frequency plan: EU868 MHz

Does the gateway receive other nodes traffic or does it not show any data?

It does receive other nodes. I used the same node using stm32duino library (STM32duino_I_NUCLEO_LRWAN1) programmed using the arduinoIDE on the same board with the same shield and I used with the same device setting and the gateway received it. but when I work with I cube expansion I dont get anything.

TxTimeout error indicates that the TxDone interrupt has not been detected by the MCU.

You need to check that the pins connection between the MCU and the Radio are correct. You need also to verify that the used pins are the ones defined in the source code.

As there is is no information on which radio shield you are using it will be difficult to help you further.

On Keil you need to specify the radio shield you want to use.
In case this is not correct the MCU will most certainly fail to communicate with the radio.

I am using I nucleo LRWAN shield and it has sx1272. How can I fix the connection ?

I suppose that the board setup that you are using is the one described at following link.

In the description it is said that the used shield is an SX1272MB2xAS.

In Keil IDE you need to select the sx1272mb2das target as shown in my previous post.
Once the change is done recompile the code and flash the board and everything should work as expected.

Thank you for your reply.
Unfortunately, I still get nothing.Capture4

I have tried the provided example using my NucleoL073+SX1272MB2DAS shield and I observed the same issue as you.

I then tried to change the compiler optimization and the firmware looks to operate better.
Just by changing the optimization level from -Oz to -O1 looks to improve as then we get txDone instead of txTimeout please refer to below log.

I would recommend that you contact ST support as it looks like there is a problem when compiler highest optimization level is activated.

Please note that I did not try to connect to a network server. Also I have used latest version of the en.i-cube_lrwan package (V2.0.0).

Log generated by changing sys_conf.h to the following:

  * @brief  Verbose level for all trace logs

  * @brief Enable trace logs
#define APP_LOG_ENABLED   1

  * @brief Enable Debugger mode
  * @note  1:ON it enables the debbugger plus 4 dgb pins, 0:OFF the debugger is OFF (lower consumption)
#define DEBUGGER_ON       1

  * @brief Disable Low Power mode
  * @note  0: LowPowerMode enabled. MCU enters stop2 mode, 1: LowPowerMode disabled. MCU enters sleep mode only

Generated log:

APP_VERSION:        V1.0.0
###### OTAA ######
###### AppKey:  2B 7E 15 16 28 AE D2 A6 AB F7 15 88 09 CF 4F 3C
###### NwkKey:  2B 7E 15 16 28 AE D2 A6 AB F7 15 88 09 CF 4F 3C
###### ABP  ######
###### AppSKey: 2B 7E 15 16 28 AE D2 A6 AB F7 15 88 09 CF 4F 3C
###### NwkSKey: 2B 7E 15 16 28 AE D2 A6 AB F7 15 88 09 CF 4F 3C
###### DevEui:  30-37-38-34-68-37-75-01
###### AppEui:  01-01-01-01-01-01-01-01
0s066:TX on freq 868500000 Hz at DR 0
31s532:MAC txDone
36s565:RX_1 on freq 868500000 Hz at DR 0
36s765:MAC rxTimeOut
37s565:RX_2 on freq 869525000 Hz at DR 0
37s765:MAC rxTimeOut

###### = JOIN FAILED
40s050:temp= 31
40s051:VDDA= 254
40s056:TX on freq 868100000 Hz at DR 0
41s581:MAC txDone
46s614:RX_1 on freq 868100000 Hz at DR 0
46s814:MAC rxTimeOut
47s614:RX_2 on freq 869525000 Hz at DR 0
47s814:MAC rxTimeOut

###### = JOIN FAILED
50s050:temp= 31
50s051:VDDA= 254
50s056:TX on freq 868300000 Hz at DR 0
51s581:MAC txDone

I did the same changes that you did, I did not even get a TxDone.
Thank you for your reply