join attempts / not working

[Michael]

I have code:

    dot = mDot::getInstance();
    dot->resetConfig();
    dot->setPublicNetwork(false);
    if ((ret = dot->setJoinMode(mDot::AUTO_OTA)) != mDot::MDOT_OK) {
            logError("failed to set Join Mode %d:%s", ret,
            mDot::getReturnCodeString(ret).c_str());
    }

    dot->setJoinRetries( 3 );

    while ((ret = dot->joinNetwork()) != mDot::MDOT_OK) {
        logError("failed to join network [%d][%s]", ret,
        mDot::getReturnCodeString(ret).c_str());
        wait_ms(1);
    }

But when I issue a join, the debug out shows only one attempt, then the mDot appears to just stop

[TRACE] Initiating join...
[TRACE] Join Network - Auto OTA
[TRACE] Join attempt #1
[DEBUG] Send Join Packet with DR3
[TRACE] 00ff
[TRACE] Number of enabled channels: 8 Mask: 00000000000000ff 500K: 01
[TRACE] Check freq: 4 - 903100000
[TRACE] Preparing frame
[TRACE] FRAME_TYPE_JOIN_REQ
[TRACE] PACKET: 23 bytes
[TRACE] BUFFER: 00dd9c860da94677705ca200000000800081555eb727cf
[DEBUG] txPower: 14 AntG: 3 radioPower: 14
[INFO] TX Frequency: 903100000 SF: 7 BW: 125 kHz POW: 14 dBm
[DEBUG] Time on air: 23 bytes 61 ms

I have no Gateway in the vicinity to connect at the moment.

• This topic was modified 8 years, 9 months ago by Michael.
• This topic was modified 8 years, 9 months ago by Michael.
• This topic was modified 8 years, 9 months ago by Michael.
• This topic was modified 8 years, 9 months ago by Michael.
• This topic was modified 8 years, 9 months ago by Michael.
• This topic was modified 8 years, 9 months ago by Michael.

[Michael]

Can anyone answer why the mDot appears to stop after one attempt/ failure?

[Michael]

I loaded the AT command application , cleared the settings starting from scratch (hopefully) and was able to successfully join per the tutorial/example. I captured the settings using AT&V.

Then I went back to my original binary and confirmed the joinNetwork() call never returns. (At that point I really don’t know if the “join” actually happened but the library/code for the joinNetwork() is somehow busted and never returns – doubtful though)

Then, I again loaded the AT command app and ran AT&V – the settings left over from my (non-Joining) code look the same as the AT successful-joining code.

I’ve stripped down my code to almost the barebones (working on that now…still), started with an online example (mDot_LoRa_Connect_Example) used older and newer libraries all to no avail.

Any ideas?

-Mike

PS. I do have a gateway available (hence the successful AT-command joins)

Here’s the debug output from my code


[ERROR] File from flash wrong size. Expected 256 - Actual 128
[INFO] Setting Config
[INFO] Saving Config
[INFO] Joining Network
[INFO] TX Frequency: 902300000 SF: 10 BW: 125 kHz POW: 14 dBm


[Mike Fiore]

Michael,

If you’re building your application using the mbed online compiler, try rolling the mbed-rtos library back to an earlier revision. I believe version 111 is known to be stable and functional. The latest versions of mbed-rtos seem to cause the mDot library to not function properly. We are looking into this.

Cheers,
Mike

[Andrew Lindsay]

Had the same issue and reverted back to a previous mbed-rtos from 4 weeks ago and that worked. I was going to step forward 1 version at a time to see where it failed.

Thanks Mike for the info, I was scratching my head for a few days trying to work out why my code kept locking up in the join process.

Is there an issue logged with mbed to have this looked at?

Andrew

[Michael]

Yes, the rollback worked (thanks!)

However…I had already considered that issue (of a bad library)…
I had archived a set of source files from a project of a few weeks ago that contained older libraries and I couldn’t get those builds to connect either. (Over the weekend I did not have any access to the actual bins from that older project).

I cannot explain that ATM but happy to be moving on.

[Mike Fiore]

Michael, I’m glad things are working again.

Andrew, I am currently investigating this issue. I was able to reproduce it using our mDot-lora-connect example program on mbed.

https://developer.mbed.org/teams/MultiTech/code/mDot_LoRa_Connect_Example/

I used revision 14 of libmDot and revision 121 of mbed. I’ve found that any revision of mbed-rtos after 111 causes the lockup while joining.

I’ll let you guys know what else I discover.

Cheers,

Mike

[Author]

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