Add check command
Add check command

blynkkk/blynk-library,blynkkk/blynk-library,blynkkk/blynk-library,ivankravets/blynk-library,blynkkk/blynk-library,ivankravets/blynk-library,ivankravets/blynk-library,ivankravets/blynk-library,blynkkk/blynk-library,ivankravets/blynk-library