Serial Port - Base64

[Carl.c (C)]

Hello,
I have problem with serial port, when I send data Base64 encoded.

Port definition: serial="/dev/ttyAMA0@38400,CHARSET(ISO-8859-1),BASE64"

Data to send: AA012000030110000A0307027155 (hex)
Base64 : qgEgAAMBEAAKAwcCcVU=

On hadware serial a get ASCII number of Base64 characters: q 0x71, g 0x67 …

But I need this AA012000030110000A0307027155 (hex)

What is wrong?

Thanks.

Sorry for my bad english.

[Wolfgang_S]

Hi Carl,
have a look at https://www.openhab.org/addons/bindings/serial1/ . You need to decode the received BASE64 string.

[Carl.c (C)]

Thanks for replay.
Problem is not when I received data. Problem is sending data over serial port. I use command
ItemName.SendCommand

[rossko57]

@Carl.c

Data to send: AA012000030110000A0307027155 (hex)

Here’s a post about sending hex

Sending 0x55 out Serial Port

I have a few US-100 serial ultrasonic distance sensors, I think I understand how to get data from the sensor, but before I do that I need to send 0x55 out that port. My item for reading the sensor is: String Hydrogen_Peroxide_Sensor {serial="/dev/ttyUSB1@9600,BASE64"}

and another

Serial binding is not sending values above 63 in Decimal or 0x3F in HEX

I am trying to send a packet of HEX codes out the serial port, but every time I try to send the packet every number is correct so long as it is below 0x3F or 63 in decimal. I am using a Null modem cable to view the sent serial data in a terminal program. Very new at OpenHAB so any help would be great. This is the line I use… sendCommand(RS485Bus,’\u0091\u0002\u0001\u0008\u0059\u0010\u0020\u0002’) As mentioned all the values are sent correctly except the \u0091 which shows up as 0x3F. Any valu…

[Carl.c (C)]

It is working, but only when is command hardcoded in rule. But in my case I need dynamic create a command…It looks like is impossible to do it.

[rossko57]

Show us your rule, if that works.

[Carl.c (C)]

When I have this in Rule:

Serial_Port.sendCommand(’\u00AA\u0001\u0020\u0000\u0003\u0001\u0010\u0000\u000A\u0003\u0007\u0002\u0071\u0055’)
It is working. But this:

val hex = new String(‘AA012000030110000A0307027155’)

val hexCommand = new String(’’)
for ( var j = 0; j < hex.length(); j+=2 ) {
hexCommand = hexCommand+"\"+“u00”+hex.substring(j, j+2)
}
Serial_Port.sendCommand(hexCommand)

Not working.

[Wolfgang_S]

Hi Carl,
the backslash in
\u00AA
is used as an escape identifier.
The backslash in your code is a literal backslash and does not escape the character after it.
Your may try this code in your rule:

  val hex = new String('AA012000030110000A0307027155')
  val hexCommand = new String('')

  for ( var j = 0; j < hex.length(); j+=2 ) {
     hexCommand = hexCommand + Integer::parseInt( hex.substring( j, j+2 ), 16 ) as char
  Serial_Port.sendCommand(hexCommand)
  }

I tested the conversion itself but not if the sendcommand itself works.
end

[Carl.c (C)]

Many thanks, your code is working.

Problem is solved