CODEWITHSUNDEEP
bashserial-portwget
afro360
afro360

Reputation: 620

Bash read from ttyUSB0 and send to URL

I am a bash novice and I am struggling with putting it all together.

What I am trying to do is:

1) Set Port (stty)
2) Read from dev/ttyUSB0 - data should look like 000118110000101 (cat or Gawk?)
3) Set read data into a variable eg DATA and create a URL eg http://domain.com/get_data.php?data=$DATA
4) load the URL with wget?
5) Wait for more data from ttyUSB0 (polling or loop?)

I have tried the php DIO extention that does work but is not reliable because it stops/starts for some reason.

ANY suggestions would be much appreciated, I will be very great-full if anyone could advise the best way to do this

Thanks

Brent

Upvotes: 4

Views: 17029

Answers (2)

afro360
afro360

Reputation: 620

This is what I used.

#Set permisions
sudo chmod o+rwx /dev/ttyUSB0


#!/bin/bash

# Port setting
stty -F /dev/ttyUSB0 cs7 cstopb -ixon raw speed 1200

# Loop
while [ 1 ]; 
do
    echo 'LOADING...'
    READ=`dd if=/dev/ttyUSB0 count=22 | sed 's/ //g'`
    echo $READ
    wget http://localhost/BASHtest/test.php?signal=$READ
    echo '[PRESS Ctrl + C TO EXIT]'
done

Upvotes: 8

user332325
user332325

Reputation:

For the first step i would advise to read to a file and then use od to get an octal (there's no binary as far as i can see) representation, because standard awk doesn't cope with NULs (i think gawk too). So after you get the bytes, you pipe it through sed script to change octals to binaries, grab the output with $() (or apostrophs) and make an URL, which you feed to wget.

The only problem i can see is blocked/nonblocked read from usb. Please report if there will be one.

Upvotes: 0

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