Microcontroller, Bluetooth LE and Mobile App Project

NOTE: Accepting Quotes Only From USA We have a custom microcontroller hardware device that communicates with a mobile device via Bluetooth LE. All we need done for the first phase is to establish communication between the hardware controller (embedded C) and the mobile device (Android or Apple). GATT structure is very simple transferring only 2800 bytes in an array every 300 ms. We will supply hardware and schematics. Specifically, the hardware is a single board containing multiple identical 8 bit microcontrollers which share a 2 wire communication bus (CLK and DATA) and connects to a central Bluetooth module via a separate 2 wire connection. So the project includes 3 tasks: 1) The 2 wire communication bus protocol will need to be bit-bang in nature (hardware peripheral not available). It is similar to I2C but the the freelancer is free to do this any way they wish as long as transmission is reliable. 2) Once the data from all the slave microcontrollers is collected by master controller (same type as the slave), it then sends this data to the Bluetooth module via a 2 wire UART connection. 3) Lastly, this data array is sent using Bluetooth LE to a mobile app (Android or Apple) for remote storage.