SYSTEM_THREAD during listen mode?

Firmware
21

Not sure what you mean by this. The photon won't cache any publish if it's not Cloud connected. I suspect it may simply ignore the requests. I suggest you add exception code around your publishes using if (Particle.connected()) { and if not connected, buffer your data or wait for connection.

22

Yes, with SYSTEM_THREAD(ENABLED) loop() will keep running parallel to Listening Mode SoftAP.

23

ā€¦ that wasnā€™t my observation the other night. Had serial.printlnā€™s and nothing was coming out. Iā€™ll strip it down and check again!

24

Try blinking the D7 LED or similar. That is how I know it runs.

Certainly any cloud and possibly any internet connection is doubtful while in listening mode since the credentials can change. I donā€™t know if the USB serial runs or not since that requires some system code. I would bet that Serial1 continues.

25

Found the culprit.

bool mdns_success = mdns.setHostname("mydevice");
        if(mdns_success) {
            // Change "MyDevice Config" to whatever you want to name
            // the web server running on your device.  This is purely
            // ornamental and does not affect the actual web server.
            mdns.addService("tcp", "http", 80, "HTTP API");
            mdns.begin();

            Serial.println("mdns success, http 80");
        }

It was blocking the setup() from proceeding to loop.

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