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Baudrate auto-detection #265
Description
When I connect a ublox device to the official u-center software, I don't have to specify the baudrate as it will just iterate through all possible baudrates to find the correct one. I would like to see the same feature integrated in this driver.
This driver could offer the option to set the uart1/baudrate to auto instead of just a number.
If this is detected, the node at start would simply try to listen to the port for some target message (e.g. UBX-MON-VER) with the desired baudrate and if successfully received, use the current rate. If not received, try the next baudrate.
Has anyone ever done something like that?
A quick & dirty prompt search gave me the following snippet to give an example of the logic I am imagining. Beware that this snipped is untested:
#!/bin/bash
DEVICE="/dev/ttyACM0" # Change this to match your serial device
BAUD_RATES=(9600 19200 38400 57600 115200 230400 460800 921600)
UBX_MON_VER_HEX="b5620a0400000e34" # UBX-MON-VER polling message
function send_poll() {
local baud=$1
echo "[*] Trying baud rate: $baud"
# Send UBX-MON-VER polling message and listen for reply
timeout 2s socat -T1 -d -d \
"EXEC:echo -ne \"$(echo $UBX_MON_VER_HEX | sed 's/../\\x&/g')\",pty,rawer" \
"PTY,link=/tmp/vserial,rawer" 2>/dev/null &
sleep 0.5
# Set baud rate and read output
stty -F $DEVICE $baud raw -echo
head -c 200 < $DEVICE | hexdump -C > /tmp/ublox_resp_${baud}.txt &
PID=$!
# Wait and kill if still running
sleep 1.5
kill $PID 2>/dev/null
if grep -q "b5 62" /tmp/ublox_resp_${baud}.txt; then
echo "[+] UBX response found at baud rate: $baud"
return 0
else
echo "[-] No UBX response at $baud"
return 1
fi
}
for rate in "${BAUD_RATES[@]}"; do
if send_poll $rate; then
echo "✅ Detected baud rate: $rate"
exit 0
fi
done
echo "❌ Failed to detect baud rate."
exit 1
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