1、添加uart0,波特率為默認的115200。串口回調(diào)函數(shù)為默認的user_uart_callbakc,TXD、RXD 為P101、P100，剛好適配PMOD2（J7),來接DA16200。

2、添加AT—client包

3、打開uart0:

4、編寫DA16200.c的函數(shù)：

主要的思路是先初始化at_clinet客戶端，根據(jù)da16200的mqtt命令初始化。如果注冊成功，向服務器訂閱與發(fā)布主題，詳見代碼：

/*

• Copyright (c) 2006-2021, RT-Thread Development Team
• SPDX-License-Identifier: Apache-2.0
• Change Logs:
• Date Author Notes
• 2023-02-24 Administrator the first version
  /
  #include
  #include
  #include
  #include
  // #ifndef ULOG_USING_SYSLOG
  //#define LOG_TAG "AT_DA16200"
  //#define LOG_LVL LOG_LVL_DBG
  //#include
  //#else
  //#include
  //#endif / ULOG_USING_SYSLOG /
  / 初始化 at_client /
  / 設置當前 AT 客戶端最大支持的一次接收數(shù)據(jù)的長度 */
  #define AT_CLIENT_RECV_BUFF_LEN 512
  #define AT_CLIENT_DEVICE_NAME "uart0"
  #define AT_WAITE_OK_MAXTIME 3000
  #define WIFI_SSID HUAWEI-H10R9U
  #define WIFI_PWD 18977381885@
  #define AT_ADDR_LEN 32
  static rt_err_t wifi_connect_state = -1;
  char ip[AT_ADDR_LEN] = {0};
  char gateway[AT_ADDR_LEN] = {0}, netmask[AT_ADDR_LEN] = {0};
  static void urc_conn_func(struct at_client *client ,const char data, rt_size_t size)
  {
  / WIFI 連 接 成 功 信 息 */
  rt_kprintf("AT Server device WIFI connect success!");
  wifi_connect_state = RT_EOK;
  }
  static void urc_recv_func(struct at_client *client ,const char data, rt_size_t size)
  {
  / 接收到服務器發(fā)送數(shù)據(jù) */
  char *ptr;
  char *p;
  rt_kprintf("AT Client receive AT Server data!");
  rt_kprintf("%s",data);
  ptr = strtok(data, ":");
  ptr = strtok(NULL, ",");
  while (ptr != NULL) {
  rt_kprintf("ptr=%sn", ptr);
  ptr = strtok(NULL, ",");
  }
  }
  int da16200_mqtt_pub(char *msg)
  {
  int result = RT_EOK;
  at_response_t resp = RT_NULL;
  if(wifi_connect_state != RT_EOK)
  {
  rt_kprintf("MQTT_client not ready!");
  return -1;
  }
  resp = at_create_resp(256, 0, rt_tick_from_millisecond(5000));
  if (resp == RT_NULL)
  {
  rt_kprintf("No memory for response structure!");
  return -2;
  }
  result = at_exec_cmd(resp, "AT+NWMQMSG='%s'",msg);
  if(resp < 0)
  {
  rt_kprintf("Pub msg ERRO! cord:%d", result);
  }
  at_delete_resp(resp);
  return result;
  }
  static void urc_func(struct at_client *client ,const char data, rt_size_t size)
  {
  / 設備啟動信息 /
  rt_kprintf("AT Server device startup!");
  rt_kprintf("%s",data);
  }
  static struct at_urc urc_table[] = {
  {"+NWMQCL:1", "rn", urc_conn_func},
  {"+NWMQMSG:", "rn", urc_recv_func},
  {"RDY", "rn", urc_func},
  };
  int at_client_port_init(void)
  {
  / 添加多種 URC 數(shù)據(jù)至 URC 列表中，當接收到同時匹配 URC 前綴和后綴的數(shù)據(jù)，執(zhí)行 URC 函數(shù) /
  at_set_urc_table(urc_table, sizeof(urc_table) / sizeof(urc_table[0]));
  return RT_EOK;
  }
  int at_client_16200_mqtt_init(void)
  {
  int result = RT_EOK;
  at_response_t resp = RT_NULL;
  / 創(chuàng)建響應結(jié)構(gòu)體，設置最大支持響應數(shù)據(jù)長度為 256 字節(jié)
  （最大響應長度用戶根據(jù)實際需求自定義），響應數(shù)據(jù)行數(shù)無限制，超時時間為 5 秒 /
  resp = at_create_resp(256, 0, rt_tick_from_millisecond(5000));
  if (resp == RT_NULL)
  {
  rt_kprintf("No memory for response structure!");
  return -2;
  }
  result = at_client_init(AT_CLIENT_DEVICE_NAME, AT_CLIENT_RECV_BUFF_LEN);
  if(result != RT_EOK)
  {
  rt_kprintf("at_clinet init erro %d",result);
  return result;
  }
  / 等待AT OK /
  result = at_client_wait_connect(AT_WAITE_OK_MAXTIME);
  if(result != RT_EOK)
  {
  rt_kprintf("client to da16200 at timeout %d",result);
  return result;
  }
  / 設置回顯 /
  if(at_exec_cmd(resp, "ATE") != RT_EOK)
  {
  rt_kprintf("AT client send ATE failed,response error!");
  return -RT_ERROR;
  }
  / 解釋返回顯狀態(tài) 如果返回是on 則再發(fā)一條關(guān)閉 /
  if(at_resp_get_line_by_kw(resp, "on") != NULL)
  {
  at_exec_cmd(resp, "ATE");
  }
  / 設置 station模式 */
  if(at_exec_cmd(resp, "AT+WFMODE=0") != RT_EOK)
  {
  rt_kprintf("AT client send AT+WFMODE failed,response error!");
  return -RT_ERROR;
  }
  /* 連接到 ap */
  if(at_exec_cmd(resp, "AT+WFJAPA=ssid,pwd") != RT_EOK)
  {
  rt_kprintf("AT client send AT+WFWFJAPA failed,response error!");
  return -RT_ERROR;
  }
  rt_thread_delay(2000);
  /* 查看IP服務器 */
  if(at_exec_cmd(resp, "AT+NWIP") != RT_EOK)
  {
  rt_kprintf("AT client send AT+NWIP failed,response error!");
  return -RT_ERROR;
  }
  rt_thread_delay(1000);
  //LOG_D("recv:%s,recv line:%d",resp->buf,resp->line_num);
  if(at_resp_parse_line_args(resp,2,"%*[^,],%[^,]",&ip)>0)
  {
  rt_kprintf("ip:%s ",ip);
  }
  else{
  rt_kprintf("NWIP erro");
  return -RT_ERROR;
  }
  /* 連接MQTT服務器*/
  if(at_exec_cmd(resp, "AT+NWMQBR=%s,%d","192.168.3.192",1883) != RT_EOK)
  {
  rt_kprintf("AT client send AT+NWMQBR failed,response error!");
  return -RT_ERROR;
  }
  /* 設置訂閱主題 */
  if(at_exec_cmd(resp, "AT+NWMQTS=%d,%s",1,"lugl_sub") != RT_EOK)
  {
  rt_kprintf("AT client send AT+NWMQTS failed,response error!");
  return -RT_ERROR;
  }
  /* 設置發(fā)布主題 */
  if(at_exec_cmd(resp, "AT+NWMQTP=%s","lugl_pub") != RT_EOK)
  {
  rt_kprintf("AT client send AT+NWMQTP failed,response error!");
  return -RT_ERROR;
  }
  at_client_port_init();
  /* 使能MQTT */
  if(at_exec_cmd(resp, "AT+NWMQCL=1") != RT_EOK)
  {
  rt_kprintf("AT client send AT+NWMQCL failed,response error!");
  return -RT_ERROR;
  }
  /* 刪 除 服 務 器 響 應 結(jié) 構(gòu) 體 */
  at_delete_resp(resp);
  return RT_EOK;
  }
  hal_entry.c:

extern struct hs300x_device temp_humi_dev;
void hal_entry(void)
{
float temp_f,humi_f;
char mqtt_send_buf[128] = {0};
rt_kprintf("nHello RT-Thread!n");
rt_uint32_t led1_pin = rt_pin_get(LED1_PIN);
at_client_16200_mqtt_init();
while (1)
{
rt_pin_write(led1_pin, PIN_HIGH);
rt_thread_mdelay(500);
rt_pin_write(led1_pin, PIN_LOW);
rt_thread_mdelay(500);
hs300x_read_data(&temp_humi_dev, &humi_f, &temp_f);
rt_sprintf(mqtt_send_buf,"{"temp":"%d.%2d","humi":"%d.%2d"}",(int)temp_f,(int)(temp_f100)%100,(int)humi_f,(int)(humi_f100)%100);
da16200_mqtt_pub(mqtt_send_buf);
// rt_kprintf("HUMI: %d.%2dn", (int)humi_f, (int)(humi_f100)%100);
// rt_kprintf("HUMI: %d.%2dn", (int)temp_f, (int)(temp_f100)%100);
}
}

實現(xiàn)在的效果：

打開mqtt客戶端，收到數(shù)據(jù)

【項目總結(jié)】

作為國產(chǎn)的RT-Thread 實時操作系統(tǒng)，生態(tài)系統(tǒng)越來越豐富。同時也有自己的RT-Thread Studio IDE來實現(xiàn)圖形化的配置，特別是集合了RASC的圖形化配置系統(tǒng)。使得入門非常容易。

【有待改善的地方】

1、FSP的更新不向前兼容，導致會出現(xiàn)很多問題，這樣新入門的朋友，可能被難倒在起點之處。
2、包更新后會覆蓋掉原來的一起代碼，如果不做備份，非常麻煩。
總之，通過這次DIY項目，加深了瑞薩+RT-Thread的編程印象，以后會經(jīng)常關(guān)注RTT，同時也會貢獻自己的力量。