printer and LED integration

Hello good afternoon, we are an emerging company in the home delivery sector of all types of products. We have thought to change software to improve our logistic and development. For them we have bought and configured a platform developed in Yi framework and phonegab. The application that we use and have purchased is [login to view URL] is from Karenderia bastiapp There you can find all the information relevant to the application in question. The requirements are the following: Integrate the program with a machine that has a serial printer and a led lights that can change color (Blue and Red), the machine is an all in one android 4.4.4 kitkat. We understand how to integrate, when the program receives an order as it currently works it receives a push up and a sound, we need the light to change from blue to red until it accepts the order, at that moment the sound is turned off and the light returns to blue. After accepting the order, the merchant can directly print the receipt a predetermined number of times beforehand without having to choose anything. We are looking for a serious person, who can meet the requirements outlined above, we also want to warn that if we are satisfied with the work done, we are ready to offer all the modifications that we have. Thank you very much and I hope to see you soon on the team.