Nest to Sensibo integration

sensibo_nest_integration.rb

##########
# This is a script I wrote as an AWS lambda function to read sensor data from a Nest and set my Sensibo accordingly
# The API clients are written by me as well and are available at
# https://github.com/ehowe/sensibo-api and https://github.com/ehowe/nest-api
# but can also be installed with `gem install sensibo-api` and `gem install nest-api`.
# The lambda function requires 2 environment variables `API_KEY` for the Sensibo API and `ACCESS_TOKEN` for the Nest API.
# Those API keys will need to be generated in the appropriate developer consoles.
# After creating the Lambda function, you can create a scheduled task in CloudWatch to run the function at whatever interval
# you choose.  Mine is set at 15 minutes.
# The function will send all output to CloudWatch as well, which you can act on if you choose.
##########

require "sensibo"
require "nest"

def lambda_handler(event:, context:)
  nest_client    = Nest.new
  sensibo_client = Sensibo.new

  nest    = nest_client.thermostats.first
  sensibo = sensibo_client.devices.first

  nest_mode               = nest.hvac_mode
  nest_target_temperature = nest.target_temperature_f.round

  old_mode               = sensibo.mode
  old_power_on           = sensibo.power_on
  old_target_temperature = sensibo.target_temperature

  new_mode               = nest_mode == "eco" ? sensibo.mode : nest_mode
  new_power_on           = nest_mode != "eco"
  new_target_temperature = sensibo.c_to_f(sensibo.f_to_c(nest_target_temperature))

  sensibo.mode               = new_mode unless new_mode == old_mode
  sensibo.power_on           = new_power_on unless new_power_on == old_power_on
  sensibo.target_temperature = new_target_temperature unless new_target_temperature == old_target_temperature

  p "changes: #{sensibo.dirty_attributes}" unless sensibo.dirty_attributes.empty?

  sensibo.save unless sensibo.dirty_attributes.empty?
rescue => e
  p "Error encountered!"
  p "error name: #{e.class.name}"
  p "error message: #{e.message}"
end