Intelligent hardware, HTTP protocol and JSON data format, especially restful API, are undoubtedly dominant. Various cloud services and data transmission are based on these protocols. JavaScript provides the best support for HTTP and JSON. When the system is developed with JavaScript, it naturally connects the cloud services and cloud resources on the Internet. Intelligent hardware, including cloud storage, cloud computing and a series of resources, can be easily called, just like you access various cloud services on your mobile phone. The rise of microservice architecture on the server side allows each node written in JavaScript to serve as a microservice in a large system and provide its own services through restful API interfaces.
On the other hand, since the gateway is a device that needs to run for a long time, it needs to have higher reliability and stability than the [img] EB end, so unit testing and integration testing are necessary, and code analysis tools are required to ensure that the code does not leak any memory and file handles. Even in the garbage collection environment, memory leakage exists, but in the embedded system, due to the limited memory, it is particularly easy to leak. Fortunately, the development and application of server-side JavaScript has been for a long time. Intelligent hardware can learn from many tools in server development.
The non transparent transmission mode of intelligent hardware Hezhou technology solves this problem well. Grm200 module directly communicates with PLC through 485, which can fully guarantee the real-time communication! Intelligent hardware can realize 1: n, N: n, N: 1 communication between computers and modules. That is, a PLC can be monitored by configuration software on multiple computers at the same time, and a computer can also monitor multiple PLCs wirelessly at the same time. The module has built-in web release. You only need to log in to the cloud monitoring website with a computer and a mobile phone. The intelligent hardware inputs the password and serial number of the module, and the PLC data can be viewed and modified through the web page. PLC does not need to write any program, customers do not need to have network knowledge, only need to be familiar with configuration software, can complete remote computer monitoring, PLC short message control, short message query, short message alarm, and web page monitoring PLC.
The GPRS module company has good quality. The intelligent hardware company points out that compared with the 9.6kbps access speed of GSM, GPRS has an access speed of 171.2kbps; In terms of connection establishment time, GSM needs 10-30 seconds, while GPRS only needs a very short time to access relevant requests; As for the cost, GSM is charged according to the connection time, while GPRS only needs to be charged according to the data flow; The utilization rate of GPRS for network resources is relatively much higher than that of GSM. The GPRS module company has relatively low connection cost and high resource utilization rate. In the GSM network, GPRS first introduced the transmission mode of packet switching, which fundamentally changed the GSM transmission mode of circuit switching mode. This is particularly important in the case of scarce wireless resources. According to the circuit switching mode, during the entire connection period, the user will occupy the wireless channel independently regardless of whether or not the user transmits data. During a session, many applications often have a lot of free time, such as Internet browsing, e-mail sending and receiving, and so on. For the packet switching mode, users only occupy resources during the transmission or reception of data, which means that multiple users can efficiently share the same radio channel, thereby improving the utilization of resources. The charging of GPRS users is mainly based on the amount of communication data, which reflects the principle of “how much you get and how much you pay”. In fact, the connection time of GPRS users may be as long as several hours, but they only need to pay relatively low connection fees.
Intelligent hardware and online software update are also one of the basic services provided by ostro. This is a basic service specially provided for applications. It can quickly complete the software update of the device, and only needs the minimum software download. It only needs to restart the necessary devices instead of restarting all the devices. Intelligent hardware and online software update are the core mechanisms to ensure manageability and maintainability. Through the cooperation between the operating system and the backend cloud platform, the software of the device is always kept in the latest and safest state. Ostro basic library: the ostro basic library includes the most basic runtime libraries distributed with the Linux kernel, such as the most commonly used C runtime library. Smart hardware, ostro can dynamically expand the scope of the basic library according to needs. Linux kernel: the kernel of ostro is a general Linux kernel, which includes the most basic driver support, hardware adaptation support, network support, file system and device management mechanism. In order to adapt to the application, ostro has made some fine adjustments to the Linux kernel, so that the kernel can support more sensors and more connection types, such as Bluetooth / IFI / ZigBee, etc.