add script to configure HC-05 bluetooth module

hc-05_porg.rb

@@ -0,0 +1,49 @@
+#!/usr/bin/env ruby
+# encoding: utf-8
+# ruby: 2.4.1
+require 'serialport'
+
+DEBUG = true # show communication
+
+unless ARGV.length > 0 and File.exist?(ARGV[0]) then
+  puts "this script will configure HC-05 bluetooth modules"
+  puts "provide path to serial port as argument"
+  exit
+end
+
+def send(at)
+  puts "< "+at if DEBUG # output request
+  @serial.write(at) # send request
+  @serial.write("\r\n") unless at.end_with?("\r\n")
+  @serial.flush
+  sleep 0.1
+  response = ""
+  until response.end_with?("OK") do
+    activity = IO.select([@serial],nil,nil,3) # wait for response
+    return nil unless activity # no response received
+    response += @serial.read(1) # get response
+  end
+  puts "> "+response if DEBUG # output response
+  return false unless response.end_with?("OK")
+  return response.chomp.gsub(/OK$/, "").chomp
+end  
+  
+@serial = SerialPort.open(ARGV[0],{ baud: 38400, databits: 8, parity: SerialPort::NONE, stop_bit: 1, flow_control: SerialPort::NONE})
+@serial.baud = 38400 # sometimes the baud rate does not get set
+@serial.read_timeout = 3000 # don't wait forever for an answer (in ms)
+
+# commands to send
+# get some general information
+commands = ["AT", "AT+VERSION?", "AT+ADDR?", "AT+ROLE?", "AT+UART?", "AT+PSWD?", "AT+BIND?"]
+#commands << "AT+NAME?" # somehow this does not work
+commands << "AT+ORGL" # reset of factory settings
+commands << 'AT+NAME="dachtuer"' # set name
+commands << "AT+PSWD=1234" # set pin (1234 by default)
+commands << "AT+UART=115200,0,2" # set usual baud rate (even parity, to be compatible with the bootloader)
+commands << "AT+RESET" # reset to take effect (goes into non ART command mode)
+
+# send all commands
+commands.each do |command|
+  raise "error communicating will HC-05. ensure it is in AT mode by pressing on button while powering up" unless send(command)
+end
+@serial.close