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AT Server

[TOC]

Introduction

Mainly realize the following functions

Parse the received AT command and respond

User can customize AT command set

Each AT command can realize four functions

Function	Expression	Description
Test function	AT+=?	Used to query the parameter format and value range
Query function	AT+?	Used to return command parameters
Setting function	AT+=...	For user-defined parameters
Execute function	AT+	Used to perform related operations

Instructions for use

Define AT adapter interface

Instantiate the at_adapter_t structure

typedef struct{
    at_server_init_t init;          /* the at server initialization port. */
    at_server_write_t write;        /* the at adapter writer buffer port.*/
    at_server_read_t read;          /* the at adapter read buffer port. */
    char * buf;                     /* the at adapter receive buffer. */
    uint32_t buf_size;              /* the at adapter receive buffer size. */
}at_adapter_t;

Define AT command set

Create an array of AT command set structures and instantiate the at_cmd_t structure

typedef struct{
    char *name;                     /* the name of at command. */
    char *args_expr;                /* the parameter of at command. */
    at_server_test_t  test;         /* to query the command parameter format and value range. */
    at_server_query_t query;        /* to return the current value of the command parameter. */
    at_server_setup_t setup;        /* for user-defined parameter value. */
    at_server_exec_t  exec;         /* to execute related operations. */
}at_cmd_t;

Initialize AT Server

The underlying interface are passed to the Server through the AT adapter. The corresponding APIs are at_server_init()。 And using the at_server_set_cmd_list() api to pass the at command list to the server.

Start the AT Server task

Call the API at_server_task() to start the server and start working, waiting to receive commands and respond.

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