ESP8266 连接 MQTT
ESP8266 连接 MQTT
主控芯片:MM32F2377 (MB-039)
WiFi 适配器:ESP8266
开发环境:IAR 7.80.4
MQTT 模拟服务器:MQTT.fx
MQTT
MQTT is an OASIS standard messaging protocol for the Internet of Things (IoT). It is designed as an extremely lightweight publish/subscribe messaging transport that is ideal for connecting remote devices with a small code footprint and minimal network bandwidth. MQTT today is used in a wide variety of industries, such as automotive, manufacturing, telecommunications, oil and gas, etc.
—— mqtt.org
MQTT(Message Queuing Telemetry Transport) 消息队列遥测传输协议,是一个基于客户端-服务器的消息发布/订阅传输协议。主要的概念有5个:
- Broker 代理:MQTT 服务器
- Publish 发布者:客户端
- Subscribe 订阅者:客户端,可订阅多个 topic
- Topic 主题:消息的类型,订阅主题之后就可以收到该 topic 的消息内容即 payload
- Payload 消息内容:具体的内容
MQTT 模拟服务器:
- EMQ MQTT X
- MQTT.fx
MQTT 模拟服务器客户端使用
我在这里使用的是第二个 MQTT.fx,用这个客户端模拟一下 MQTT 的 Publish/Subscribe。
首先在 EMQ 官网上找到 MQTT 接入信息,主要是 Broker 和 TCP 端口号
在接下来的模拟服务器使用中,Broker Address 可以直接用broker-cn.emqx.io
,也可以到查询网上查找对应的 IP 地址:47.111.117.220
EMQ 分为在国内有专门的服务器,连接更方便一些,国外的 Broker Address 是
broker.emqx.io
打开 MQTT.fx,点击齿轮状的设置按钮,填写 Broker Address,Port 等,再到 User Credentials 里填写用户名和密码,OK,Connect
连接成功后,发布消息:填 topic,我这里 topic 叫 esp8266,以 json 格式进行发送,点击 Publish
去订阅消息,切换到 Subscribe,订阅 esp8266 这个 topic,然后再发布消息,就可以在这里看到了
ESP8266 + MQTT
ESP8266 的介绍以及基本使用可查看上一篇 CSDN 「Rose Island」MM32F3277 + ESP8266 使用指南(1. 实现 TCP Client 透传)。
首先需要确认 AT 指令集具有 MQTT 指令:
- 乐鑫官方 AT 下载地址
- Ai-thinker AT 下载地址 (选择 ESP8266 MQTT 默认透传 AT 固件)
具体的 MQTT AT 指令集可查阅:
- ESP MQTT AT Commands
ESP8266 MQTT 配置指令
配置 STA 模式:
AT+CWMODE=1
连接路由器:
AT+CWJAP="wifiName","wifiPsd"
配置 MQTT 属性:
AT+MQTTUSERCFG=0,1,"clientID","username","password",0,0,""
连接制定的 MQTT broker:
AT+MQTTCONN=0,"47.111.117.220",1883,0
查询 MQTT 连接状态:
AT+MQTTCONN?
订阅 topic 数据:
AT+MQTTSUB=0,"topicName",1
发布 topic 数据:
AT+MQTTPUB=0,"topicName","payload",1,0
MM32F3277 + ESP8266 + MQTT
这里放的是与 MQTT 相关的函数,ESP8266 连网和 TCP 连接等函数可见「Rose Island」MM32F3277 + ESP8266 使用指南(1. 实现 TCP Client 透传)。
esp8266.c
/// @brief Configure ESP8266 MQTT parameters.
/// @param clientId: Client ID num.
/// @param username: MQTT server username to log in MQTT broker.
/// @param psd: MQTT server password to log in MQTT broker.
/// @param scheme: Verification methods.
/// @retval None.
void ESP8266_MQTT_Init(char* clientId, char* username, char* psd, ESP8266_MQTT_Scheme_Typedef scheme)
{ESP8266_MQTT_InitStruct.ipAddr.mqttIPAddr0 = ESP8266_MQTT_HOST_IPADDR_0;ESP8266_MQTT_InitStruct.ipAddr.mqttIPAddr1 = ESP8266_MQTT_HOST_IPADDR_1;ESP8266_MQTT_InitStruct.ipAddr.mqttIPAddr2 = ESP8266_MQTT_HOST_IPADDR_2;ESP8266_MQTT_InitStruct.ipAddr.mqttIPAddr3 = ESP8266_MQTT_HOST_IPADDR_3;ESP8266_MQTT_InitStruct.port = (uint32_t)ESP8266_MQTT_PORT;ESP8266_MQTT_InitStruct.clientID = clientId;ESP8266_MQTT_InitStruct.username = username;ESP8266_MQTT_InitStruct.password = psd;ESP8266_MQTT_InitStruct.scheme = scheme;ESP8266_MQTT_InitStruct.mqttStatus = NO_INIT;
}
/// @brief Connect with MQTT server.
/// @param clientId: Client ID num.
/// @param username: MQTT server username to log in MQTT broker.
/// @param psd: MQTT server password to log in MQTT broker.
/// @param scheme: Verification methods.
/// @retval ESP8266 OK or ERROR.
ESP8266_Error_Typedef ESP8266_Connect_MQTT(char* clientId, char* username, char* psd, ESP8266_MQTT_Scheme_Typedef scheme)
{ESP8266_MQTT_Init(clientId, username, psd, scheme);char *cmd = (char*)malloc(256);sprintf(cmd, "AT+MQTTUSERCFG=0,1,\"%s\",\"%s\",\"%s\",0,0,\"\"", clientId, username, psd);if(ESP8266_Send_AT_Command_Times(cmd, "OK", 0xffff, 2)){printf("Error: Fail to Configure MQTT \n");return ESP8266_ERROR;}else{ESP8266_MQTT_InitStruct.mqttStatus = USERCFG_SET;printf("OK: Configure MQTT successfully \n");}sprintf(cmd, "AT+MQTTCONN=0,\"%d.%d.%d.%d\",%d,0", ESP8266_MQTT_HOST_IPADDR_0, ESP8266_MQTT_HOST_IPADDR_1, ESP8266_MQTT_HOST_IPADDR_2, ESP8266_MQTT_HOST_IPADDR_3, ESP8266_MQTT_PORT);if(ESP8266_Send_AT_Command_Times(cmd, "OK", 0xffff, 2)){ESP8266_MQTT_InitStruct.mqttStatus = DISCONNECTED;printf("Error: Fail to Connect MQTT \n");return ESP8266_ERROR;}else{ESP8266_MQTT_InitStruct.mqttStatus = CONNECTED;printf("OK: Connect MQTT successfully \n");}return ESP8266_OK;
}
/// @brief Check MQTT client state.
/// @param None.
/// @retval ESP8266 OK or ERROR.
ESP8266_Error_Typedef ESP8266_Check_MQTT()
{char *cmd = "AT+MQTTCONN?";if(ESP8266_Send_AT_Command_Times(cmd, "OK", 0xffff, 2)){// printf("Error: Fail to Connect MQTT \n");return ESP8266_ERROR;}else{// printf("OK: Connect MQTT successfully \n");}return ESP8266_OK;
}
/// @brief Subscribe topic from MQTT server.
/// @param subTopic: Subscribed topic name.
/// @retval ESP8266 OK or ERROR.
ESP8266_Error_Typedef ESP8266_MQTT_SUB(char* subTopic)
{char *cmd = (char*)malloc(strlen("AT+MQTTSUB=0,\"%s\",1") + strlen(subTopic));sprintf(cmd, "AT+MQTTSUB=0,\"%s\",1", subTopic);if(ESP8266_Send_AT_Command_Times(cmd, "OK", 0xffff, 2)){ESP8266_MQTT_InitStruct.mqttStatus = CONNECTED_NO_SUB;printf("Error: Fail to Subscribe topic \n");return ESP8266_ERROR;}else{ESP8266_MQTT_InitStruct.mqttStatus = CONNECTED_AND_SUB;printf("OK: Subscribe topic successfully \n");}return ESP8266_OK;
}
/// @brief Unsubscribe topic from MQTT server.
/// @param subTopic: Unsubscribed topic name.
/// @retval ESP8266 OK or ERROR.
ESP8266_Error_Typedef ESP8266_MQTT_UNSUB(char* subTopic)
{char *cmd = (char*)malloc(strlen("AT+MQTTUNSUB=0,\"\"") + strlen(subTopic));sprintf(cmd, "AT+MQTTUNSUB=0,\"%s\"", subTopic);if(ESP8266_Send_AT_Command_Times(cmd, "OK", 0xffff, 2)){ESP8266_MQTT_InitStruct.mqttStatus = CONNECTED_NO_SUB;printf("Error: Fail to Subscribe topic \n");return ESP8266_ERROR;}else{ESP8266_MQTT_InitStruct.mqttStatus = CONNECTED_AND_SUB;printf("OK: Subscribe topic successfully \n");}return ESP8266_OK;
}
/// @brief Publish topic to MQTT server.
/// @param subTopic: Publish topic name.
/// @retval ESP8266 OK or ERROR.
ESP8266_Error_Typedef ESP8266_MQTT_PUB(char* pubTopic, char* data)
{char *cmd = (char*)malloc(strlen("AT+MQTTPUB=0,\"\",\"\",1,0") + strlen(pubTopic) + strlen(data));sprintf(cmd, "AT+MQTTPUB=0,\"%s\",\"%s\",1,0", pubTopic, data);if(ESP8266_Send_AT_Command_Times(cmd, "OK", 0xffff, 2)){printf("Error: Fail to Publish topic \n");return ESP8266_ERROR;}else{printf("OK: Publish topic successfully \n");}return ESP8266_OK;
}
/// @brief Disconnect with MQTT server.
/// @param None.
/// @retval ESP8266 OK or ERROR.
ESP8266_Error_Typedef ESP8266_MQTT_CLEAN()
{char *cmd = "AT+MQTTCLEAN=0";if(ESP8266_Send_AT_Command_Times(cmd, "OK\r\n", 0xffff, 2)){printf("Error: Fail to Disconnect MQTT \n");return ESP8266_ERROR;}else{ESP8266_MQTT_InitStruct.mqttStatus = NO_INIT;printf("OK: Disconnect MQTT successfully \n");}return ESP8266_OK;
}
/// @brief Send key-value to MQTT.
/// @param dataSend: The whole key-value.
/// @param deviceId: Device id.
/// @param deviceType: Device type.
/// @param dataType: Data type.
/// @param dataValue: Data value.
/// @retval None.
void ESP8266_Data_Send(char *dataSend, char *deviceId, char *deviceType, char *dataType, float dataValue)
{sprintf(dataSend,"{\r\n\"device_id\":\"%s\",\r\n\"device_type\":\"%s\",\r\n\"data_type\":\"%s\",\r\n\"data_value\":\"%.2f\"\r\n}",deviceId, deviceType, dataType, dataValue);printf("data sent is %s \n", dataSend);
}
esp8266.h
typedef enum{NO_INIT = (uint8_t)0,USERCFG_SET = (uint8_t)1,CONNCFG_SET = (uint8_t)2,DISCONNECTED = (uint8_t)3,CONNECTED = (uint8_t)4,CONNECTED_NO_SUB = (uint8_t)5,CONNECTED_AND_SUB = (uint8_t)6
} ESP8266_MQTT_Status_Typedef;typedef enum{NO_TLS = (uint8_t)1,TLS_NO_CA = (uint8_t)2,TLS_SERVICE_CA = (uint8_t)3,TLS_CLIENT_CA = (uint8_t)4,TLS_SERVICE_CLIENT_CA = (uint8_t)5,WS_TCP = (uint8_t)6,WSS_NO_CA = (uint8_t)7,WSS_SERVICE_CA = (uint8_t)8,WSS_CLIENT_CA = (uint8_t)9,WSS_SERVICE_CLIENT_CA = (uint8_t)10
} ESP8266_MQTT_Scheme_Typedef;#define ESP8266_MQTT_CLIENTIP "mm32f3270"
#define ESP8266_MQTT_USERNAME "mm32"
#define ESP8266_MQTT_PSD "mm32psd"
#define ESP8266_MQTT_HOST "broker-cn.emqx.io"
#define ESP8266_MQTT_HOST_IPADDR_0 47
#define ESP8266_MQTT_HOST_IPADDR_1 111
#define ESP8266_MQTT_HOST_IPADDR_2 117
#define ESP8266_MQTT_HOST_IPADDR_3 220
#define ESP8266_MQTT_PORT 1883
#define ESP8266_MQTT_TOPIC "esp8266"typedef struct
{uint8_t mqttIPAddr0;uint8_t mqttIPAddr1;uint8_t mqttIPAddr2;uint8_t mqttIPAddr3;
}ESP8266_MQTT_IPADDR_Typedef;typedef struct
{ESP8266_MQTT_IPADDR_Typedef ipAddr;uint32_t port;char* clientID;char* username;char* password;ESP8266_MQTT_Scheme_Typedef scheme;ESP8266_MQTT_Status_Typedef mqttStatus;
} ESP8266_MQTT_Typedef;
ESP8266_MQTT_Typedef ESP8266_MQTT_InitStruct;
Conclusion
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