Lmic returns unknown Event Codes 100 and 20

[Dardrai]

Unchatched events
in the methode void onEvent(ev_t event) some event code are getting dispatched and I don't know what they are for the message codes are 100 and 20

Environment

• Version of LMIC being used: 3.0.99 (but it also earlier lib version had this "issue")
• Version of Arduino IDE being used: 1.8.11
• Network provider: TTN
• Region:EU
• Board: NRF52840 and Feather M4 Express
• Radio: Adafruit LoRa Radio FeatherWing - RFM95W (SX127x LoRa)

Example Message Code 100:
https://i.imgur.com/jBBkkQL.png

Normaly (if Debug is activated) the output should look like:
12:22:05.651 -> EV_TXSTART
12:22:05.651 -> Message Code: 17
12:22:10.817 -> EV_JOINED
12:22:10.817 -> Message Code: 6
12:22:10.817 -> EV_TXSTART
12:22:10.817 -> Message Code: 17
12:22:12.912 -> EV_TXCOMPLETE

I'm shure that the OTAA Keys are stored in the right format and values (not like in Issue #492 ) then sometimes I receive the Event Code 100 or 20 - and later the lmic "recovers" and is sending correctly.
What is the meaning of these two event Codes?

[Dardrai]

ConsoleLog (only Event Code 100) - Event Code 20 is very rare (could it be that this is Code is only thrown if something did happen on the TTN Side?)

12:45:48.362 -> EV_TXSTART
12:45:48.362 -> Message Code: 17
12:45:48.362 -> Message Code: 100
12:45:50.465 -> EV_TXCOMPLETE
12:46:20.474 -> Message Code: 10
12:46:20.474 -> Volt: 3.74
12:46:20.474 -> Percent: 43
12:46:20.474 -> Range: 265
12:46:20.474 -> EV_TXSTART
12:46:20.474 -> Message Code: 17
12:46:20.474 -> Message Code: 100
12:46:22.576 -> EV_TXCOMPLETE
12:46:52.598 -> Message Code: 10
12:46:52.598 -> Volt: 3.74
12:46:52.598 -> Percent: 43
12:46:52.598 -> Range: 265

[terrillmoore]

See comment on #542. The text "Message code" appears nowhere in the arduino-lmic liibrary, so you are running a sketch that I'm not aware of. I have no idea what that might be.

[Dardrai]

the text "Message Code:" I'll add in my sketch for every event (when the debug is on) this is just for debug/dev purpose. But the event with this number is thrown somewhere from lmic/ttn or gw

In your Example you'd catch these errors with default case:
default:
Serial.print(F("Unknown event: "));
Serial.println((unsigned) ev);
break;

and then the out would be:
Unknown event: 100
Unknown event: 20

I found in the file src\lmic\lmic.h fallowing enum that could match the error code:
enum { MAX_MISSED_BCNS = 20 }; // threshold for triggering rejoin requests
enum { MAX_RXSYMS = 100 }; // stop tracking beacon beyond this

[terrillmoore]

@Dardrai -- those are not error codes. In addition, we don't see those errors in other BSPs, so something else is going on.

I don't have your hardware or your sketch, so I'm unable to test; I'm happy to advise or correct the problem, but need your help to find it. My suggestion is that you use git bisect to find the commit that broke your code. If you're not familiar with using git bisect it's straighforward:

1. install git (if needed)
2. move the arduino-lmic from your arduino libraries directory to some other place.
3. use git clone to checkout arduino-lmic from github
4. cd to the arduino-lmic directory.
5. git checkout v3.1.0
6. git bisect start
7. git bisect bad (because v3.1.0 is bad)
8. git bisect good v3.99.3 (because v3.99.3 is ok)
9. Git has now checked out a revision. Compile and test.
10. If this rev is good say git bisect good; otherwise git bisect bad.
11. repeat steps 9 and 10 until git says "no commits left"; it will leave you at the bad commit.
12. use git log --oneline to show the commit history from the bad commit down, and post that here.

[Dardrai]

Okay I did found the problem - Error Code 20 is EV_JOIN_TXCOMPLETE which was missing from my sketch.