Send and receive SMS text messages with Ruby and a GSM/GPRS modem

peter (Peter Cooperx) — Thu, 08 Mar 2007 11:41:34 GMT
require 'serialport'

require 'time'



class GSM

  

  SMSC = "+447785016005"  # SMSC for Vodafone UK - change for other networks



  def initialize(options = {})

    @port = SerialPort.new(options[:port] || 3, options[:baud] || 38400, options[:bits] || 8, options[:stop] || 1, SerialPort::NONE)

    @debug = options[:debug]

    cmd("AT")

    # Set to text mode

    cmd("AT+CMGF=1")

    # Set SMSC number

    cmd("AT+CSCA=\"#{SMSC}\"")    

  end

  

  def close

    @port.close

  end

  

  def cmd(cmd)

    @port.write(cmd + "\r")

    wait

  end

  

  def wait

    buffer = ''

    while IO.select([@port], [], [], 0.25)

      chr = @port.getc.chr;

      print chr if @debug == true

      buffer += chr

    end

    buffer

  end



  def send_sms(options)

    cmd("AT+CMGS=\"#{options[:number]}\"")

    cmd("#{options[:message][0..140]}#{26.chr}\r\r")

    sleep 3

    wait

    cmd("AT")

  end

  

  class SMS

    attr_accessor :id, :sender, :message, :connection

    attr_writer :time

    

    def initialize(params)

        @id = params[:id]; @sender = params[:sender]; @time = params[:time]; @message = params[:message]; @connection = params[:connection]

    end

    

    def delete

      @connection.cmd("AT+CMGD=#{@id}")

    end

    

    def time

      # This MAY need to be changed for non-UK situations, I'm not sure

      # how standardized SMS timestamps are..

      Time.parse(@time.sub(/(\d+)\D+(\d+)\D+(\d+)/, '\2/\3/20\1'))

    end

  end

  

  def messages

    sms = cmd("AT+CMGL=\"ALL\"")

    # Ugly, ugly, ugly!

    msgs = sms.scan(/\+CMGL\:\s*?(\d+)\,.*?\,\"(.+?)\"\,.*?\,\"(.+?)\".*?\n(.*)/)

    return nil unless msgs

    msgs.collect!{ |m| GSM::SMS.new(:connection => self, :id => m[0], :sender => m[1], :time => m[2], :message => m[3].chomp) } rescue nil

  end

end





destination_number = "+44 someone else"



p = GSM.new(:debug => false)



# Send a text message

p.send_sms(:number => destination_number, :message => "Test at #{Time.now}")



# Read text messages from phone

p.messages.each do |msg|

  puts "#{msg.id} - #{msg.time} - #{msg.sender} - #{msg.message}"

  # msg.delete

end
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Send and receive SMS text messages with Ruby and a GSM/GPRS modem
