Espeasy uart break

[Smotek7]

I need to send HEX data to the device, but the device waits about 590us before sending "uart break".
Can you create rules with uart break?
My imagination.
I will send to ESPeasy http commad, according to the rules, after uart break and then Hex string (eg 0x55, 0x0C, 0x00, 0x03, 0x50, 0x90, 0x01, 0x05, 0xC7, 0x842, 0x02, 0x02, 0x02 0xE6, 0x0C).
In the opposite direction, when the device answers, for example, 55 0E FF FF 00 03 01 07 05 04 02 83 19 00 00 9C 0E
sent to the Controller, e.g. UDP.
Can the uart break be created in ESPeasy?

[Ath]

After re-reading your question a couple of times, I still don't have a clue what you're trying to say with "uart break", can you elaborate on what that's supposed to do/be?

[Smotek7]

I also encountered it for the first time.
Some devices require a specified time at the start of log.0.
That's the Break.
So far I managed to do it in Arduino nano like this

Code: Select all

#define baud_work 19200
#define baud_break 9200
uint8_t master_tx_buf[] = {0x55, 0x0C, 0x00, 0x03, 0x50, 0x90, 0x01, 0x05, 0xC7, 0x02, 0x82, 0x03, 0x64, 0xE7, 0x0C};
uint8_t break_tx_buf[] = {0x00};

void send_break() {
  Serial.flush();
  Serial.end();
  Serial.begin(baud_break);
  Serial.write((char *)break_tx_buf, sizeof(break_tx_buf));
  delayMicroseconds(90);
  Serial.end();
  Serial.begin(baud_work);
 
}

I understand it so that the exact length of "Break" is reached,
so the speed changes and 0x00 is sent.
This corresponds to some time segment Log.0 na TX.

Would I be able to write similar code in Rules?
I don't know how fast the operations in Rules are performed.

[Ath]

Would I be able to write similar code in Rules?
I don't know how fast the operations in Rules are performed.

Don't think that's currently possible. Haven't encountered anything like this before. Looks like the RS232 lines are to be held low for some time before the transmission starts. Maybe a "longpulse_ms" command can send the right kind of pulse on the GPIOs involved. But I'm not sure about the change in baudrate. Don't think the serial output plugins allow to change the baudrate during flight, but you can try, of course.

What (type of) device is expecting this kind of signal?

[TD-er]

Sounds a bit like the device does perform an "autobaud" check to detect the baud rate.

On the RN2483A (LoRaWAN module) you also need to set the baud rate to the lowest value and send out a zero byte.
This effectively pulls the RX pin of the device to a state which cannot be decoded into a valid byte and thus it starts an autobaud sequence.

[Smotek7]

It is the Nice gate electronics.
No, it does not detect speed.
The speed change is done so that byte 0x00 lasts the correct time.
If the flood speed remained, 0x00 would be a long "Break".
By reducing the speed, the correct length of time "Break" is achieved.
Longpulse would be the solution, but the Break is 590 microseconds.