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Re-formatted code and made some small changes to behaviour.

Browse source 
At some point this repo might get updated to MQTT v5. I have to
carefully read the standard and see what has changed.
This commit is contained in:
A.M. Rowsell 2024-05-06 08:02:52 -04:00
commit a84326db7f
Signed by: amr
GPG key ID: 0B6E2D8375CF79A9
2 changed files with 194 additions and 188 deletions
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382
mqtt.c
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@ -104,66 +104,66 @@ void ICACHE_FLASH_ATTR data_recv_callback(void *arg, char *pdata, unsigned short
#endif
mqtt_message_type msgType = ((mqtt_message_type)pdata[0] >> 4) & 0x0F;
switch(msgType) {
case MQTT_MSG_TYPE_CONNACK:
os_printf("CONNACK recieved...\n");
switch(pdata[3]) {
case 0:
os_printf("Connection accepted.\n");
break;
case 1:
os_printf("Connection refused -- incorrect protocol version.\n");
break;
case 2:
os_printf("Connection refused -- illegal identifier.\n");
break;
case 3:
os_printf("Connection refused -- broker offline or not available.\n");
break;
case 4:
os_printf("Connection refused -- bad username or password.\n");
break;
case 5:
os_printf("Connection refused -- not authorized.\n");
break;
default:
os_printf("Connection refused -- illegal CONNACK return code.\n");
break;
}
if(session->connack_cb != NULL) {
session->connack_cb(pdata);
}
case MQTT_MSG_TYPE_CONNACK:
os_printf("CONNACK recieved...\n");
switch(pdata[3]) {
case 0:
os_printf("Connection accepted.\n");
break;
case MQTT_MSG_TYPE_PUBLISH:
os_printf("Application message from server: %s\n", &pdata[3]); // probably incorrect
if(session->publish_cb != NULL) {
session->publish_cb(pdata);
}
case 1:
os_printf("Connection refused -- incorrect protocol version.\n");
break;
case MQTT_MSG_TYPE_SUBACK:
os_printf("Subscription acknowledged\n");
case 2:
os_printf("Connection refused -- illegal identifier.\n");
break;
case MQTT_MSG_TYPE_UNSUBACK:
os_printf("Unsubscription acknowledged\n");
case 3:
os_printf("Connection refused -- broker offline or not available.\n");
break;
case MQTT_MSG_TYPE_PINGRESP:
os_printf("Pong!\n");
case 4:
os_printf("Connection refused -- bad username or password.\n");
break;
case 5:
os_printf("Connection refused -- not authorized.\n");
break;
// all remaining cases listed to avoid warnings
case MQTT_MSG_TYPE_CONNECT:
case MQTT_MSG_TYPE_PUBACK:
case MQTT_MSG_TYPE_PUBREC:
case MQTT_MSG_TYPE_PUBREL:
case MQTT_MSG_TYPE_PUBCOMP:
case MQTT_MSG_TYPE_SUBSCRIBE:
case MQTT_MSG_TYPE_UNSUBSCRIBE:
case MQTT_MSG_TYPE_PINGREQ:
case MQTT_MSG_TYPE_DISCONNECT:
default:
if(msgType == MQTT_MSG_TYPE_DISCONNECT) {
os_printf("MQTT Disconnect packet\n");
}
return;
os_printf("Connection refused -- illegal CONNACK return code.\n");
break;
}
if(session->connack_cb != NULL) {
session->connack_cb(pdata);
}
break;
case MQTT_MSG_TYPE_PUBLISH:
os_printf("Application message from server: %s\n", &pdata[3]); // probably incorrect
if(session->publish_cb != NULL) {
session->publish_cb(pdata);
}
break;
case MQTT_MSG_TYPE_SUBACK:
os_printf("Subscription acknowledged\n");
break;
case MQTT_MSG_TYPE_UNSUBACK:
os_printf("Unsubscription acknowledged\n");
break;
case MQTT_MSG_TYPE_PINGRESP:
os_printf("Pong!\n");
break;
// all remaining cases listed to avoid warnings
case MQTT_MSG_TYPE_CONNECT:
case MQTT_MSG_TYPE_PUBACK:
case MQTT_MSG_TYPE_PUBREC:
case MQTT_MSG_TYPE_PUBREL:
case MQTT_MSG_TYPE_PUBCOMP:
case MQTT_MSG_TYPE_SUBSCRIBE:
case MQTT_MSG_TYPE_UNSUBSCRIBE:
case MQTT_MSG_TYPE_PINGREQ:
case MQTT_MSG_TYPE_DISCONNECT:
default:
if(msgType == MQTT_MSG_TYPE_DISCONNECT) {
os_printf("MQTT Disconnect packet\n");
}
return;
break;
}
}
@ -188,8 +188,9 @@ void ICACHE_FLASH_ATTR reconnected_callback(void *arg, sint8 err) {
void ICACHE_FLASH_ATTR disconnected_callback(void *arg) {
os_printf("Disconnected\n");
os_timer_disarm(&pubTimer);
os_timer_disarm(&pingTimer);
/* These timers should be disarmed by the userspace code */
/* os_timer_disarm(&pubTimer); */
/* os_timer_disarm(&pingTimer); */
}
uint8_t ICACHE_FLASH_ATTR tcpConnect(void *arg) {
@ -279,149 +280,148 @@ uint8_t ICACHE_FLASH_ATTR mqttSend(mqtt_session_t *session, uint8_t *data, uint3
uint8_t *fullPacket;
uint8_t *remaining_len_encoded;
switch(msgType) {
case MQTT_MSG_TYPE_CONNECT: {
const uint8_t varDefaults[10] = { 0x00, 0x04, 0x4D, 0x51, 0x54, 0x54, 0x04, 0xC2, 0x00, 0x32 }; // variable header is always the same for Connect
pPacket->fixedHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 5); // fixed header cannot be longer than 5
pPacket->fixedHeader[0] = ((uint8_t)msgType << 4) & 0xF0; // make sure lower 4 are clear
// prepare variable header
pPacket->varHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 10); // 10 bytes for connect
os_memcpy(pPacket->varHeader, varDefaults, 10); // copy defaults
pPacket->varHeader_len = 10;
// prepare payload
uint32_t offset = 0; // keep track of how many bytes we have copied
uint32_t maxPayloadLength = session->client_id_len + session->username_len + session->password_len + 12; // length info can only take a maximum of 12 bytes
pPacket->payload = (uint8_t *)os_zalloc(sizeof(uint8_t) * maxPayloadLength);
// copy client id to payload: 2 bytes for size, then client id.
// insert a 0
os_memset(pPacket->payload + offset, 0, 1); // MSB is always 0
offset += 1;
os_memcpy(pPacket->payload + offset, &session->client_id_len, 1); // LSB is length of string
offset += 1;
os_memcpy(pPacket->payload + offset, session->client_id, session->client_id_len); // and copy string
offset += session->client_id_len;
// copy username to payload: same as client id, 2 bytes for size, then username
// insert a 0
os_memset(pPacket->payload + offset, 0, 1);
offset += 1;
os_memcpy(pPacket->payload + offset, &session->username_len, 1);
offset += 1;
os_memcpy(pPacket->payload + offset, session->username, session->username_len);
offset += session->username_len;
// Password: same as username and client id, 2 bytes for size, then password
// insert a 0
os_memset(pPacket->payload + offset, 0, 1);
offset += 1;
os_memcpy(pPacket->payload + offset, &session->password_len, 1);
offset += 1;
os_memcpy(pPacket->payload + offset, session->password, session->password_len);
offset += session->password_len;
pPacket->payload_len = offset; // the length of the payload is the same as our offset
case MQTT_MSG_TYPE_CONNECT: {
const uint8_t varDefaults[10] = { 0x00, 0x04, 0x4D, 0x51, 0x54, 0x54, 0x04, 0xC2, 0x00, 0x32 }; // variable header is always the same for Connect
pPacket->fixedHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 5); // fixed header cannot be longer than 5
pPacket->fixedHeader[0] = ((uint8_t)msgType << 4) & 0xF0; // make sure lower 4 are clear
// prepare variable header
pPacket->varHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 10); // 10 bytes for connect
os_memcpy(pPacket->varHeader, varDefaults, 10); // copy defaults
pPacket->varHeader_len = 10;
// prepare payload
uint32_t offset = 0; // keep track of how many bytes we have copied
uint32_t maxPayloadLength = session->client_id_len + session->username_len + session->password_len + 12; // length info can only take a maximum of 12 bytes
pPacket->payload = (uint8_t *)os_zalloc(sizeof(uint8_t) * maxPayloadLength);
// copy client id to payload: 2 bytes for size, then client id.
// insert a 0
os_memset(pPacket->payload + offset, 0, 1); // MSB is always 0
offset += 1;
os_memcpy(pPacket->payload + offset, &session->client_id_len, 1); // LSB is length of string
offset += 1;
os_memcpy(pPacket->payload + offset, session->client_id, session->client_id_len); // and copy string
offset += session->client_id_len;
// copy username to payload: same as client id, 2 bytes for size, then username
// insert a 0
os_memset(pPacket->payload + offset, 0, 1);
offset += 1;
os_memcpy(pPacket->payload + offset, &session->username_len, 1);
offset += 1;
os_memcpy(pPacket->payload + offset, session->username, session->username_len);
offset += session->username_len;
// Password: same as username and client id, 2 bytes for size, then password
// insert a 0
os_memset(pPacket->payload + offset, 0, 1);
offset += 1;
os_memcpy(pPacket->payload + offset, &session->password_len, 1);
offset += 1;
os_memcpy(pPacket->payload + offset, session->password, session->password_len);
offset += session->password_len;
pPacket->payload_len = offset; // the length of the payload is the same as our offset
#ifdef DEBUG
os_printf("Total offset: %d\n", offset);
os_printf("Total offset: %d\n", offset);
#endif
// the remaining length is the size of the packet, minus the first byte and the bytes taken by the remaining length bytes themselves
// they are encoded per the MQTT spec, section 2.2.3
// the first byte returned by encodeLength is the number of bytes to follow, as it can be anywhere from 1 to 4 bytes to encode the length
remaining_len_encoded = encodeLength((uint32_t)(pPacket->varHeader_len + pPacket->payload_len));
os_memcpy(pPacket->fixedHeader + 1, remaining_len_encoded + 1, remaining_len_encoded[0]);
pPacket->fixedHeader_len = remaining_len_encoded[0] + 1; // fixed header length is the number of bytes used to encode the remaining length, plus 1 for the fixed CONNECT byte
// the full length is the length of the varHeader, payload, and fixedHeader
pPacket->length = (pPacket->varHeader_len + pPacket->payload_len + pPacket->fixedHeader_len);
// the remaining length is the size of the packet, minus the first byte and the bytes taken by the remaining length bytes themselves
// they are encoded per the MQTT spec, section 2.2.3
// the first byte returned by encodeLength is the number of bytes to follow, as it can be anywhere from 1 to 4 bytes to encode the length
remaining_len_encoded = encodeLength((uint32_t)(pPacket->varHeader_len + pPacket->payload_len));
os_memcpy(pPacket->fixedHeader + 1, remaining_len_encoded + 1, remaining_len_encoded[0]);
pPacket->fixedHeader_len = remaining_len_encoded[0] + 1; // fixed header length is the number of bytes used to encode the remaining length, plus 1 for the fixed CONNECT byte
// the full length is the length of the varHeader, payload, and fixedHeader
pPacket->length = (pPacket->varHeader_len + pPacket->payload_len + pPacket->fixedHeader_len);
#ifdef DEBUG
os_printf("Packet length: %d\n", pPacket->length);
os_printf("Packet length: %d\n", pPacket->length);
#endif
// construct packet data
fullPacket = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->length);
os_memcpy(fullPacket, pPacket->fixedHeader, pPacket->fixedHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len, pPacket->varHeader, pPacket->varHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len + pPacket->varHeader_len, pPacket->payload, pPacket->payload_len);
break;
}
case MQTT_MSG_TYPE_PUBLISH: {
// prepare for publish
pPacket->fixedHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 5);
pPacket->fixedHeader[0] = (MQTT_MSG_TYPE_PUBLISH << 4) & 0xF0; // clear lower 4 bits, we don't need DUP, QOS or RETAIN
// construct packet data
fullPacket = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->length);
os_memcpy(fullPacket, pPacket->fixedHeader, pPacket->fixedHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len, pPacket->varHeader, pPacket->varHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len + pPacket->varHeader_len, pPacket->payload, pPacket->payload_len);
break;
}
case MQTT_MSG_TYPE_PUBLISH: {
// prepare for publish
pPacket->fixedHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 5);
pPacket->fixedHeader[0] = (MQTT_MSG_TYPE_PUBLISH << 4) & 0xF0; // clear lower 4 bits, we don't need DUP, QOS or RETAIN
// variable header
// A PUBLISH Packet MUST NOT contain a Packet Identifier if its QoS value is set to 0 [MQTT-2.3.1-5].
pPacket->varHeader_len = session->topic_name_len + 2; // we have no packet identifier, as we are QOS 0
pPacket->varHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->varHeader_len);
os_memset(pPacket->varHeader, 0, 1);
os_memcpy(pPacket->varHeader + 1, &session->topic_name_len, 1);
os_memcpy(pPacket->varHeader + 2, session->topic_name, session->topic_name_len);
// variable header
// A PUBLISH Packet MUST NOT contain a Packet Identifier if its QoS value is set to 0 [MQTT-2.3.1-5].
pPacket->varHeader_len = session->topic_name_len + 2; // we have no packet identifier, as we are QOS 0
pPacket->varHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->varHeader_len);
os_memset(pPacket->varHeader, 0, 1);
os_memcpy(pPacket->varHeader + 1, &session->topic_name_len, 1);
os_memcpy(pPacket->varHeader + 2, session->topic_name, session->topic_name_len);
//payload
pPacket->payload_len = len;
pPacket->payload = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->payload_len);
os_memcpy(pPacket->payload, data, pPacket->payload_len);
// calculate remaining length for fixed header
remaining_len_encoded = encodeLength((uint32_t)(pPacket->varHeader_len + pPacket->payload_len));
os_memcpy(pPacket->fixedHeader + 1, remaining_len_encoded + 1, remaining_len_encoded[0]);
pPacket->fixedHeader_len = remaining_len_encoded[0] + 1; // fixed header length is the number of bytes used to encode the remaining length, plus 1 for the fixed CONNECT byte
// the full length is the length of the varHeader, payload, and fixedHeader
pPacket->length = (pPacket->varHeader_len + pPacket->payload_len + pPacket->fixedHeader_len);
os_printf("Packet length: %d\n", pPacket->length);
// construct packet data
fullPacket = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->length);
os_memcpy(fullPacket, pPacket->fixedHeader, pPacket->fixedHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len, pPacket->varHeader, pPacket->varHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len + pPacket->varHeader_len, pPacket->payload, pPacket->payload_len);
break;
}
case MQTT_MSG_TYPE_SUBSCRIBE:
case MQTT_MSG_TYPE_UNSUBSCRIBE:
// prepare for subscribe
pPacket->fixedHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 5);
pPacket->fixedHeader[0] = ((msgType << 4) & 0xF0) | 0x02;
//payload
pPacket->payload_len = len;
pPacket->payload = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->payload_len);
os_memcpy(pPacket->payload, data, pPacket->payload_len);
// calculate remaining length for fixed header
remaining_len_encoded = encodeLength((uint32_t)(pPacket->varHeader_len + pPacket->payload_len));
os_memcpy(pPacket->fixedHeader + 1, remaining_len_encoded + 1, remaining_len_encoded[0]);
pPacket->fixedHeader_len = remaining_len_encoded[0] + 1; // fixed header length is the number of bytes used to encode the remaining length, plus 1 for the fixed CONNECT byte
// the full length is the length of the varHeader, payload, and fixedHeader
pPacket->length = (pPacket->varHeader_len + pPacket->payload_len + pPacket->fixedHeader_len);
os_printf("Packet length: %d\n", pPacket->length);
// construct packet data
fullPacket = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->length);
os_memcpy(fullPacket, pPacket->fixedHeader, pPacket->fixedHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len, pPacket->varHeader, pPacket->varHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len + pPacket->varHeader_len, pPacket->payload, pPacket->payload_len);
break;
}
case MQTT_MSG_TYPE_SUBSCRIBE:
case MQTT_MSG_TYPE_UNSUBSCRIBE:
// prepare for subscribe
pPacket->fixedHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 5);
pPacket->fixedHeader[0] = ((msgType << 4) & 0xF0) | 0x02;
pPacket->varHeader_len = 2;
pPacket->varHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->varHeader_len);
os_memset(pPacket->varHeader, 0, 2); // set packet ID to 0
pPacket->varHeader_len = 2;
pPacket->varHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->varHeader_len);
os_memset(pPacket->varHeader, 0, 2); // set packet ID to 0
uint8_t extraByte = (msgType == MQTT_MSG_TYPE_SUBSCRIBE) ? 3 : 2;
pPacket->payload_len = session->topic_name_len + extraByte;
pPacket->payload = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->payload_len);
pPacket->payload[1] = session->topic_name_len % 0xFF;
pPacket->payload[0] = session->topic_name_len / 0xFF;
os_memcpy(pPacket->payload + 2, session->topic_name, session->topic_name_len); // copy topic name
if(msgType == MQTT_MSG_TYPE_SUBSCRIBE) pPacket->payload[session->topic_name_len+2] = 0;
uint8_t extraByte = (msgType == MQTT_MSG_TYPE_SUBSCRIBE) ? 3 : 2;
pPacket->payload_len = session->topic_name_len + extraByte;
pPacket->payload = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->payload_len);
pPacket->payload[1] = session->topic_name_len % 0xFF;
pPacket->payload[0] = session->topic_name_len / 0xFF;
os_memcpy(pPacket->payload + 2, session->topic_name, session->topic_name_len); // copy topic name
if(msgType == MQTT_MSG_TYPE_SUBSCRIBE) pPacket->payload[session->topic_name_len+2] = 0;
// calculate remaining length for fixed header
remaining_len_encoded = encodeLength((uint32_t)(pPacket->varHeader_len + pPacket->payload_len));
os_memcpy(pPacket->fixedHeader + 1, remaining_len_encoded + 1, remaining_len_encoded[0]);
pPacket->fixedHeader_len = remaining_len_encoded[0] + 1; // fixed header length is the number of bytes used to encode the remaining length, plus 1 for the fixed CONNECT byte
// the full length is the length of the varHeader, payload, and fixedHeader
pPacket->length = (pPacket->varHeader_len + pPacket->payload_len + pPacket->fixedHeader_len);
os_printf("Packet length: %d\n", pPacket->length);
// construct packet data
fullPacket = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->length);
os_memcpy(fullPacket, pPacket->fixedHeader, pPacket->fixedHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len, pPacket->varHeader, pPacket->varHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len + pPacket->varHeader_len, pPacket->payload, pPacket->payload_len);
// calculate remaining length for fixed header
remaining_len_encoded = encodeLength((uint32_t)(pPacket->varHeader_len + pPacket->payload_len));
os_memcpy(pPacket->fixedHeader + 1, remaining_len_encoded + 1, remaining_len_encoded[0]);
pPacket->fixedHeader_len = remaining_len_encoded[0] + 1; // fixed header length is the number of bytes used to encode the remaining length, plus 1 for the fixed CONNECT byte
// the full length is the length of the varHeader, payload, and fixedHeader
pPacket->length = (pPacket->varHeader_len + pPacket->payload_len + pPacket->fixedHeader_len);
os_printf("Packet length: %d\n", pPacket->length);
// construct packet data
fullPacket = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->length);
os_memcpy(fullPacket, pPacket->fixedHeader, pPacket->fixedHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len, pPacket->varHeader, pPacket->varHeader_len);
os_memcpy(fullPacket + pPacket->fixedHeader_len + pPacket->varHeader_len, pPacket->payload, pPacket->payload_len);
break;
case MQTT_MSG_TYPE_DISCONNECT:
case MQTT_MSG_TYPE_PINGREQ:
// PINGREQ and DISCONNECT have no varHeader or payload, it's just two bytes
pPacket->fixedHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 2);
pPacket->fixedHeader[0] = (msgType << 4) & 0xF0; // bottom nibble must be clear
pPacket->fixedHeader[1] = 0; // remaining length is zero
pPacket->fixedHeader_len = 2;
pPacket->length = pPacket->fixedHeader_len;
// In order to avoid undefined behaviour, we must allocate
// something to varHeader and payload, as they get passed
// to free() at the end of this function
pPacket->varHeader = (uint8_t *)os_zalloc(1);
pPacket->payload = (uint8_t *)os_zalloc(1);
// copy the fixedHeader to fullPacket, and we're done!
fullPacket = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->length);
os_memcpy(fullPacket, pPacket->fixedHeader, pPacket->fixedHeader_len);
break;
default:
break;
case MQTT_MSG_TYPE_PINGREQ:
case MQTT_MSG_TYPE_DISCONNECT:
// PINGREQ has no varHeader or payload, it's just two bytes
// 0xC0 0x00
pPacket->fixedHeader = (uint8_t *)os_zalloc(sizeof(uint8_t) * 2);
pPacket->fixedHeader[0] = (msgType << 4) & 0xF0; // bottom nibble must be clear
pPacket->fixedHeader[1] = 0; // remaining length is zero
pPacket->fixedHeader_len = 2;
pPacket->length = pPacket->fixedHeader_len;
// In order to avoid undefined behaviour, we must allocate
// something to varHeader and payload, as they get passed
// to free() at the end of this function
pPacket->varHeader = (uint8_t *)os_zalloc(1);
pPacket->payload = (uint8_t *)os_zalloc(1);
// copy the fixedHeader to fullPacket, and we're done!
fullPacket = (uint8_t *)os_zalloc(sizeof(uint8_t) * pPacket->length);
os_memcpy(fullPacket, pPacket->fixedHeader, pPacket->fixedHeader_len);
break;
default:
// something has gone wrong
os_printf("Attempt to send incorrect packet type: %d", (uint8_t)msgType);
return -1;
// something has gone wrong
os_printf("Attempt to send incorrect packet type: %d", (uint8_t)msgType);
return -1;
}
#ifdef DEBUG
os_printf("About to send MQTT command type: %d...\n", (uint8_t)msgType);
@ -435,6 +435,12 @@ uint8_t ICACHE_FLASH_ATTR mqttSend(mqtt_session_t *session, uint8_t *data, uint3
if(msgType != MQTT_MSG_TYPE_DISCONNECT) {
os_timer_setfn(&MQTT_KeepAliveTimer, (os_timer_func_t *)pingAlive, session);
os_timer_arm(&MQTT_KeepAliveTimer, 30000, 0);
} else {
/* If we send a disconnect packet, we must close the connection ourselves,
per MQTT standard 3.14.4 */
espconn_disconnect(session->activeConnection);
os_timer_disarm(&MQTT_KeepAliveTimer); // ensure the keepalive timer is disarmed
return 0;
}
} else {
os_printf("No wifi! Narf!\n");

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