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Full Discussion: Read line from serial device with BASH
Top Forums Shell Programming and Scripting Read line from serial device with BASH Post 302984926 by Chalk-X on Wednesday 2nd of November 2016 05:23:14 PM
Old 11-02-2016
No. I tested that variation also. The read won't end unless I use a timeout. Then the variable is blank. And, of course, the device becomes unresponsive until I intervene with Gnu Screen. I must be overlooking something simple. There must be a way to duplicate what I'm doing with this device in PowerShell.

I set up a serial connection between a Windows 7 PC and a Ubuntu 16 laptop. Using TeraTerm on the Windows machine, I can send a string...then handily read it from BASH on the laptop with:

read whatever < /dev/ttyUSB0

No problem. So...there's something different about the Numato device...something I'm missing.
 

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LEARN ABOUT REDHAT

rfcomm

RFCOMM(1)																 RFCOMM(1)

NAME

       rfcomm - RFCOMM configuration utility

SYNOPSIS

       rfcomm [ options ] < command > < dev >

DESCRIPTION

       rfcomm  is  used to set up, maintain, and inspect the RFCOMM configuration of the Bluetooth subsystem in the Linux kernel. If no command is
       given, or if the option -a is used, rfcomm prints information about the configured RFCOMM devices.

OPTIONS

       -h     Gives a list of possible commands.

       -a     Prints information about all configured RFCOMM devices.

       -i <hciX> | <bdaddr>
	      The command is applied to device hciX , which must be the name or the address of an installed Bluetooth device.  If  not	specified,
	      the command will be use the first available Bluetooth device.

COMMANDS

       show <dev>
	      Display the information about the specified device.

       conn <dev> [bdaddr] [channel]
	      Connect the RFCOMM device to the remote Bluetooth device on the specified channel. If no channel is specified, it will use the chan-
	      nel number 1. If also the Bluetooth address is left out, it tries to read the data from the config file. This command can be  termi-
	      nated with the key sequence CTRL-C.

       bind <dev> [bdaddr] [channel]
	      This  binds the RFCOMM device to a remote Bluetooth device. The command did not establish a connection to the remote device, it only
	      creates the binding. The connection will be establish right after an application tries to open the RFCOMM device.

       release <dev>
	      This command releases a defined RFCOMM binding.

AUTHOR

       Written by Marcel Holtmann <marcel@holtmann.org>.

								  APRIL 28, 2002							 RFCOMM(1)
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