Your company won a new contract from the Highways agency to setup speed monitor devices on all residential streets. The project manager anticipates the installation of 20 million speed monitoring devices over the next two years. Each speed monitoring device is equipped with motion sensors that get activated when a vehicle passes by. The device picks up vehicle speed and number plate on each reading and should send the data back into a central database. Some of the sensors are installed in areas with inconsistent connectivity, and some sensors may lose connectivity due to nearby road works. How should you design the data ingestion for this system?