esp8266_cwrap.rb

require 'serialport'

port = "/dev/ttyAMA0"
bps = 115200

class ESP8266
  def initialize(port, bps)
    @serial_port = SerialPort.new(port, bps)
  end

  def command(cmd)
    puts(cmd)
    @serial_port.write(cmd + "\r\n")
    loop do
      sleep 0.05
      res = @serial_port.gets()
      if res && !res.chomp.empty?
        puts(res)
        break if res.include? 'OK'
      end
    end
  end
end

esp8266 = ESP8266.new(port, bps)
esp8266.command('AT')
esp8266.command('AT+CWMODE=1')
loop do
  esp8266.command('AT+CWLAP')
  sleep 1
end