Mobike, as one of the better-developed bike-sharing companies, has recently been in the news because of its acquisition by Meituan and an article about abandoning its peers. From a technical point of view, what is the communication method when it is unlocked?
Note that one of Mobike's car baskets has solar cells in it, so the energy issue is easy to explain. Let's reproduce the unlocking process first: open the app, scan the code, and the car lock will be unlocked. . In the middle, the bicycle number is actually submitted to the server, and the server sends back instructions to the bicycle, unlocks the car, and starts timing and billing. When the ride is over, the lock is manually closed, the trip is automatically ended, the billing is ended, the riding distance is returned, and the deduction is completed, so Mobike also transmits the lock information to the background. This is just some of my guesses.
The above answer is very simple. In the era of the Internet of Everything, there are two types of IoT cards, 13-bit and 11-bit, and 13-bit is the most used, which can be understood as a calling card that castrates the calling function. SMS is a short message method, and Mobike can complete the unlocking after receiving the short message command sent by the background. For the specific process, please refer to Wang Dashuai's answer :
Stage 2: Pure IoT mode, issuing instructions through the server
The price of network traffic is getting cheaper and cheaper. The special card for the Internet of Things can be used for more than 20 years (replace the card when it is used up). It is cheaper than text messages in the process of frequent use, and the amount of information obtained is greater. Including various vehicle status, etc.