Dear Sir.
We are a team from Viet Nam with experiences and knowledge in this field.
We have finished the projects for many vehicle such as bus, taxi (include connecting to taxi meter), motorbike, pet...
I think the most importance of these devices is stability and my all clients are happy.
Beside the domestic client, we also cooperated with Indian and Malaysian clients.
These are Gsm and Gps module we used: Sim 908, 900, 800 from Simcom; M95 from Quectel
And the Mcu: Pic, Lpc21xx, ArmCortex M0, M1, M3...
We tracking the following signal: informstion from gps, input, output of device (door, air coditioner, acc, sos..), adc for fuel, camera, taxi fare, and whichever you require. And the function updating firmware over air is plus.
We also develop server software and application for android and ios for tracking device.
I think we suit with your project and wde hope to cooperate with you in upcomming project.
Please feel to free to contact us, this is our skype :tdesolution
We can show you some system which we already completed.
Best regards,