"传感网应用开发：NB模块AT指令发送代码分析"

The presentation "Sensor Network Application Development: Code Writing and Analysis.pptx" provides a comprehensive guide to the development and analysis of code for a sensor network application. One of the key components covered in the presentation is the process of sending AT commands to an NB module. The code writing and analysis process begins with the development of a function called "send_AT_command", which is responsible for transmitting the AT commands to the NB module. The function takes a format string and a variable number of arguments as input. Inside the "send_AT_command" function, a buffer called "nbiot_AT_cmd_buff" is defined to store the formatted AT command. Additionally, variables such as "tx_count" and "tx_size" are initialized to manage the transmission of the command. The "vsprintf" function is used to format the AT command string based on the input format and arguments provided. Once the AT command is formatted and stored in the buffer, the length of the command is calculated using "strlen". The code then enters a loop to begin transmitting the command to the NB module using the HAL_UART_Transmit function. The transmission process continues until the entire command has been sent. Overall, the code writing and analysis process for sending AT commands to an NB module involves the development of a specialized function, the use of formatting and variable argument handling, as well as the implementation of a transmission loop. This ensures that the AT commands are correctly formatted and efficiently transmitted to the sensor network, allowing for seamless communication and operation. The presentation provides a detailed breakdown of each step involved in the process, making it a valuable resource for developers and engineers working on sensor network applications.