mruby + esp32 + thingspeak @ wroc_love.rb 2018

bme280.rb

include ESP32

API_KEY = "****"
SSID = "****"
PASS = ""****"

i2c = I2C.new(I2C::PORT0, scl: 22, sda: 21).init(I2C::MASTER)
bme280 = SENSOR::BME280.new(i2c, 0x76)
bme280.init

puts "Getting ready to start wifi"

wifi = ESP32::WiFi.new

wifi.on_connected do |ip|
  puts "Connected: #{ip}"

  soc = TCPSocket.open("api.thingspeak.com", 80)
  msg = "HEAD /update?field1=#{bme280.pressure}&field2=#{bme280.temperature}&field3=#{bme280.humidity}&api_key=#{API_KEY} HTTP/1.1\r\nHost: api.thingspeak.com\r\n\r\n"
  msg.split("\r\n").each do |e|
    puts ">>> #{e}"
  end
  soc.send(msg, 0)
  
  loop do
      buf = soc.recv(128, 0)
      break if buf.length == 0
      print buf
  end

  # Deep sleep for half a minute
  ESP32::System.deep_sleep_for(30 * 1000000)
end

wifi.on_disconnected do
  puts "Disconnected"
end

puts "Connecting to wifi"
wifi.connect(SSID, PASS)

while true do
  mem = ESP32::System.available_memory() / 1000
  puts "Free heap: #{mem}K"

  ESP32::System.delay(10 * 1000)
end

esp32_build_config.rb

MRuby::Build.new do |conf|
  toolchain :gcc

  [conf.cc, conf.objc, conf.asm].each do |cc|
    cc.command = 'gcc'
    cc.flags = [%w(-g -std=gnu99 -O3 -Wall -Werror-implicit-function-declaration -Wdeclaration-after-statement -Wwrite-strings)]
  end

  [conf.cxx].each do |cxx|
    cxx.command = 'g++'
    cxx.flags = [%w(-g -O3 -Wall -Werror-implicit-function-declaration)]
  end

  conf.linker do |linker|
    linker.command = 'gcc'
    linker.flags = [%w()]
    linker.libraries = %w(m)
    linker.library_paths = []
  end

  conf.archiver do |archiver|
    archiver.command = "ar"
  end

  conf.gembox 'default'
end

MRuby::CrossBuild.new('esp32') do |conf|
  toolchain :gcc

  conf.cc do |cc|
    cc.include_paths << ENV["COMPONENT_INCLUDES"].split(' ')

    cc.flags << '-Wno-maybe-uninitialized'
    cc.flags.collect! { |x| x.gsub('-MP', '') }

    cc.defines << %w(MRB_HEAP_PAGE_SIZE=64)
    cc.defines << %w(MRB_USE_IV_SEGLIST)
    cc.defines << %w(KHASH_DEFAULT_SIZE=8)
    cc.defines << %w(MRB_STR_BUF_MIN_SIZE=20)
    cc.defines << %w(MRB_GC_STRESS)

    cc.defines << %w(ESP_PLATFORM)
  end

  conf.cxx do |cxx|
    cxx.include_paths = conf.cc.include_paths.dup

    cxx.flags.collect! { |x| x.gsub('-MP', '') }

    cxx.defines = conf.cc.defines.dup
  end

  conf.bins = []
  conf.build_mrbtest_lib_only
  conf.disable_cxx_exception

  conf.gem :core => "mruby-print"
  conf.gem :core => "mruby-compiler"
  conf.gem :core => "mruby-toplevel-ext"
  conf.gem :core => "mruby-struct"
  conf.gem :github => 'iij/mruby-pack'
  conf.gem :github => "mruby-esp32/mruby-esp32-i2c"
  conf.gem :github => 'icm7216/mruby-esp32-i2c-bme280'
  conf.gem :github => "mruby-esp32/mruby-esp32-system"
  conf.gem :github => "mruby-esp32/mruby-esp32-wifi"
  conf.gem :github => 'mruby-esp32/mruby-socket', :branch => 'esp32'
end