30 minutes delay between LMIC_setTxData2 and actual send

[i-g-g-y]

Hello.

There is a serious bug in the timing of the library.

I am using;

• version 4.1.1
• IDE 2.3.2
• network is Helium
• EU868
• nRF52840 custom board
• nRF52840
• RFM95

I keep track of time and send out a packet every 2 hours with;

`
// Check if there is not a current TX/RX job running
if (LMIC.opmode & OP_TXRXPEND) {
Serial.println(F("OP_TXRXPEND, not sending"));
} else {
// Prepare upstream data transmission at the next possible time.
last_tx_time = millis();
Serial.print("\r\nTx req.");
os_setTimedCallback(&sendjob, os_getTime()+ms2osticks(100), do_send);

  LMIC_setTxData2(1, txBuffer, sizeof(txBuffer)-1, 0);

  Serial.println(F("Packet queued!"));

}
`

Expected behavior

This should send data out after 100ms, as the os_runloop_once() is constantly being called.

Most times it works flawlessly, but sometimes I get 30 minutes of delay between queuing the packet and the actual send. Why is that?

23:02:53.432 -> Tx req.Packet queued!
23:02:53.571 -> Packet queued!
23:03:26.946 -> ........................1341662618: EV_TXSTART
23:26:46.086 -> 1341829732: EV_TXCOMPLETE (includes waiting for RX windows)