Managed to get our first MQTT connection started!
The code is now pretty messy, as I've just been hacking it together so far. It's basically hardcoded, so the next steps will be to parameterise everything. I also need to rethink the data structures, and function names/structures. I need to make this feel more like an API to be called by a user. This will naturally help organize the functions.
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2 changed files with 119 additions and 14 deletions
117
mqtt.c
117
mqtt.c
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@ -18,6 +18,7 @@
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*/
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static os_timer_t oneTimer;
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static os_timer_t testTimer;
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LOCAL void ICACHE_FLASH_ATTR data_sent_callback(void *arg) {
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os_printf("Data sent!\n");
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@ -35,11 +36,6 @@ LOCAL void ICACHE_FLASH_ATTR connected_callback(void *arg) {
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espconn_regist_sentcb(pConn, (espconn_sent_callback)data_sent_callback);
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// enable keepalive
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espconn_set_opt(pConn, ESPCONN_KEEPALIVE);
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char *pbuf = (char *)os_zalloc(2 * 1024);
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uint8_t getReq[] = "GET / HTTP/1.1\r\n\r\n";
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os_sprintf(pbuf, getReq);
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espconn_send(pConn, pbuf, os_strlen(pbuf));
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os_free(pbuf);
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}
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LOCAL void ICACHE_FLASH_ATTR reconnected_callback(void *arg, sint8 err) {
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@ -66,7 +62,7 @@ LOCAL uint8_t ICACHE_FLASH_ATTR tcpConnect(void *arg) {
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conn.proto.tcp = &tcp_s;
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conn.type = ESPCONN_TCP;
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conn.proto.tcp->local_port = espconn_port();
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conn.proto.tcp->remote_port = 80;
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conn.proto.tcp->remote_port = session->port;
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conn.state = ESPCONN_NONE;
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os_memcpy(conn.proto.tcp->remote_ip, session->ip, 4);
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@ -91,8 +87,109 @@ LOCAL uint8_t ICACHE_FLASH_ATTR mqtt_connect(mqtt_session_t *session) {
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}
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LOCAL uint8_t ICACHE_FLASH_ATTR mqtt_send(mqtt_session_t *session, mqtt_message_t *message) {
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/*************************************************************************************/
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/* Function: mqtt_send */
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/* Parameters: active mqtt_session_t, pointer to data, data length, and message type */
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/* This function must do a few different things: */
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/* * It must create the packet based on the message type and data */
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/* * It must send the packet to the server */
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/*************************************************************************************/
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LOCAL uint8_t ICACHE_FLASH_ATTR mqtt_send(mqtt_session_t *session, uint8_t *data, uint32_t len, mqtt_message_type msgType) {
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/** First thing to do is check the packet type.
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* This will inform everything else we do
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*/
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os_printf("Entering mqtt_send!\n");
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LOCAL mqtt_packet_t packet;
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LOCAL mqtt_packet_t *pPacket = &packet;
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uint8_t *fullPacket;
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switch(msgType) {
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case MQTT_MSG_TYPE_CONNECT:
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// prepare packet for connect type
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pPacket->fixedHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 2); // fixed header cannot be longer than 5
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pPacket->fixedHeader[0] = ((uint8_t)msgType << 4) & 0xF0; // make sure lower 4 are clear
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// prepare variable header
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pPacket->varHeader = os_zalloc(sizeof(uint8_t) * 10); // 10 bytes for connect
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pPacket->varHeader[0] = 0;
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pPacket->varHeader[1] = 4; // length of protocol name
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pPacket->varHeader[2] = 0x4D; // M
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pPacket->varHeader[3] = 0x51; // Q
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pPacket->varHeader[4] = 0x54; // T
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pPacket->varHeader[5] = 0x54; // T
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pPacket->varHeader[6] = 4; // protocol level
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pPacket->varHeader[7] = 0b11000010; // connect flags, no QOS or will, clean session, user/pass
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pPacket->varHeader[8] = 0;
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pPacket->varHeader[9] = 10; // keepalive time
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pPacket->varHeader_len = 10;
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// prepare payload
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pPacket->payload = (uint8_t *)os_zalloc(sizeof(uint8_t) * 26);
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// client identifier "FRZN0"
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pPacket->payload[0] = 0;
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pPacket->payload[1] = 5;
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pPacket->payload[2] = 0x46; // F
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pPacket->payload[3] = 0x52; // R
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pPacket->payload[4] = 0x5A; // Z
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pPacket->payload[5] = 0x4E; // N
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pPacket->payload[6] = 0x30; // 0
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// Username
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pPacket->payload[7] = 0;
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pPacket->payload[8] = 11;
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// os_memcpy(pPacket->payload + 9, data, username_len);
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pPacket->payload[9] = 0x4D; // M
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pPacket->payload[10] = 0x72; // r
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pPacket->payload[11] = 0x41; // A
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pPacket->payload[12] = 0x75; // u
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pPacket->payload[13] = 0x72; // r
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pPacket->payload[14] = 0x65; // e
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pPacket->payload[15] = 0x6C; // l
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pPacket->payload[16] = 0x69; // i
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pPacket->payload[17] = 0x75; // u
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pPacket->payload[18] = 0x73; // s
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pPacket->payload[19] = 0x52; // R
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// Password
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pPacket->payload[20] = 0;
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pPacket->payload[21] = 4;
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// os_memcpy(pPacket->payload + 22, data + offset, password_len);
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pPacket->payload[22] = 0x74; // t
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pPacket->payload[23] = 0x65; // e
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pPacket->payload[24] = 0x73; // s
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pPacket->payload[25] = 0x74; // t
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pPacket->payload_len = 26;
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pPacket->fixedHeader[1] = 36; // length of varHeader + payload_len
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pPacket->length = 38;
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fullPacket = os_zalloc(sizeof(uint8_t) * pPacket->length); //full packet length is 38
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os_memcpy(fullPacket, pPacket->fixedHeader, 2);
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os_memcpy(fullPacket + 2, pPacket->varHeader, 10);
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os_memcpy(fullPacket + 12, pPacket->payload, 26);
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break;
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case MQTT_MSG_TYPE_PUBLISH:
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// prepare for publish
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break;
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case MQTT_MSG_TYPE_SUBSCRIBE:
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// prepare for subscribe
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break;
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case MQTT_MSG_TYPE_UNSUBSCRIBE:
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// prepare for unsubscribe
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break;
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case MQTT_MSG_TYPE_PINGREQ:
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// prepare for ping
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break;
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case MQTT_MSG_TYPE_DISCONNECT:
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// disconnect from broker
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break;
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default:
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// something has gone wrong
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os_printf("Attempt to send incorrect packet type: %d", (uint8_t)msgType);
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return -1;
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}
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os_printf("About to send MQTT connect...\n");
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espconn_send(session->activeConnection, fullPacket, pPacket->length);
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os_free(fullPacket);
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}
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LOCAL void ICACHE_FLASH_ATTR test(void *arg) {
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os_printf("Entered test!\n");
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mqtt_session_t *pSession = (mqtt_session_t *)arg;
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mqtt_send(pSession, NULL, 0, MQTT_MSG_TYPE_CONNECT);
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}
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void ICACHE_FLASH_ATTR user_init() {
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@ -115,7 +212,7 @@ void ICACHE_FLASH_ATTR user_init() {
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char testUser[] = "MrAureliusR";
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char testPass[] = "test";
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char testTopic[] = "input";
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pGlobalSession->port = 80; // port 80 just for testing
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pGlobalSession->port = 1883; // port 80 just for testing
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const char esp_tcp_server_ip[4] = {51, 15, 65, 206}; // remote IP of TCP server
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os_memcpy(pGlobalSession->ip, esp_tcp_server_ip, 4);
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pGlobalSession->username = &testUser[0];
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@ -123,4 +220,6 @@ void ICACHE_FLASH_ATTR user_init() {
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pGlobalSession->topic_name = &testTopic[0];
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os_timer_setfn(&oneTimer, (os_timer_func_t *)tcpConnect, pGlobalSession);
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os_timer_arm(&oneTimer, 15000, 0);
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os_timer_setfn(&testTimer, (os_timer_func_t *)test, pGlobalSession);
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os_timer_arm(&testTimer, 16000, 0);
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}
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16
mqtt.h
16
mqtt.h
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@ -23,10 +23,16 @@ typedef enum mqtt_message_enum
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} mqtt_message_type;
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typedef struct {
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uint8_t *message;
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uint16_t length;
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mqtt_message_type type;
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} mqtt_message_t;
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uint8_t *fixedHeader;
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uint32_t fixedHeader_len;
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uint8_t *varHeader;
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uint32_t varHeader_len;
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uint8_t *payload;
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uint32_t payload_len;
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uint32_t length;
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mqtt_message_type msgType;
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} mqtt_packet_t;
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typedef struct {
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uint8_t ip[4];
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@ -47,5 +53,5 @@ LOCAL void ICACHE_FLASH_ATTR reconnected_callback(void *arg, sint8 err);
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LOCAL void ICACHE_FLASH_ATTR connected_callback(void *arg);
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LOCAL void ICACHE_FLASH_ATTR data_recv_callback(void *arg, char *pdata, unsigned short len);
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LOCAL void ICACHE_FLASH_ATTR data_sent_callback(void *arg);
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LOCAL uint8_t ICACHE_FLASH_ATTR mqtt_send(mqtt_session_t *session, mqtt_message_t *message);
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LOCAL uint8_t ICACHE_FLASH_ATTR mqtt_send(mqtt_session_t *session, uint8_t *data, uint32_t len, mqtt_message_type msgType);
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LOCAL uint8_t ICACHE_FLASH_ATTR mqtt_connect(mqtt_session_t *session);
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