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Write each packet with a single call to _client->write()

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This commit is contained in:
Nicholas O'Leary 2012-10-28 00:14:33 +01:00
parent 97e9614780
commit 569ada9937
1 changed files with 67 additions and 63 deletions
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74
PubSubClient/PubSubClient.cpp
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@ -51,7 +51,8 @@ boolean PubSubClient::connect(char *id, char *user, char *pass, char* willTopic,
if (result) {
nextMsgId = 1;
uint8_t d[9] = {0x00,0x06,'M','Q','I','s','d','p',MQTTPROTOCOLVERSION};
uint8_t length = 0;
// Leave room in the buffer for header and variable length field
uint16_t length = 5;
unsigned int j;
for (j = 0;j<9;j++) {
buffer[length++] = d[j];
@ -75,7 +76,7 @@ boolean PubSubClient::connect(char *id, char *user, char *pass, char* willTopic,
buffer[length++] = v;
buffer[length++] = ((MQTT_KEEPALIVE) >> 8);
buffer[length++] = ((MQTT_KEEPALIVE) & 0xff);
buffer[length++] = ((MQTT_KEEPALIVE) & 0xFF);
length = writeString(id,buffer,length);
if (willTopic) {
length = writeString(willTopic,buffer,length);
@ -89,11 +90,12 @@ boolean PubSubClient::connect(char *id, char *user, char *pass, char* willTopic,
}
}
write(MQTTCONNECT,buffer,length);
lastOutActivity = millis();
lastInActivity = millis();
write(MQTTCONNECT,buffer,length-5);
lastInActivity = lastOutActivity = millis();
while (!_client->available()) {
unsigned long t= millis();
unsigned long t = millis();
if (t-lastInActivity > MQTT_KEEPALIVE*1000UL) {
_client->stop();
return false;
@ -151,8 +153,9 @@ boolean PubSubClient::loop() {
_client->stop();
return false;
} else {
_client->write(MQTTPINGREQ);
_client->write((uint8_t)0);
buffer[0] = MQTTPINGREQ;
buffer[1] = 0;
_client->write(buffer,2);
lastOutActivity = t;
lastInActivity = t;
pingOutstanding = true;
@ -176,8 +179,9 @@ boolean PubSubClient::loop() {
callback(topic,payload,len-4-tl);
}
} else if (type == MQTTPINGREQ) {
_client->write(MQTTPINGRESP);
_client->write((uint8_t)0);
buffer[0] = MQTTPINGRESP;
buffer[1] = 0;
_client->write(buffer,2);
} else if (type == MQTTPINGRESP) {
pingOutstanding = false;
}
@ -198,7 +202,9 @@ boolean PubSubClient::publish(char* topic, uint8_t* payload, unsigned int plengt
boolean PubSubClient::publish(char* topic, uint8_t* payload, unsigned int plength, boolean retained) {
if (connected()) {
uint16_t length = writeString(topic,buffer,false);
// Leave room in the buffer for header and variable length field
uint16_t length = 5;
length = writeString(topic,buffer,length);
uint16_t i;
for (i=0;i<plength;i++) {
buffer[length++] = payload[i];
@ -207,13 +213,12 @@ boolean PubSubClient::publish(char* topic, uint8_t* payload, unsigned int plengt
if (retained) {
header |= 1;
}
return write(header,buffer,length);
return write(header,buffer,length-5);
}
return false;
}
boolean PubSubClient::publish_P(char* topic, uint8_t* PROGMEM payload, unsigned int plength, boolean retained) {
uint8_t lenBuf[4];
uint8_t llen = 0;
uint8_t digit;
int rc;
@ -233,7 +238,7 @@ boolean PubSubClient::publish_P(char* topic, uint8_t* PROGMEM payload, unsigned
if (retained) {
header |= 1;
}
buffer[pos++] = header;
len = plength + 2 + tlen;
do {
digit = len % 128;
@ -241,18 +246,13 @@ boolean PubSubClient::publish_P(char* topic, uint8_t* PROGMEM payload, unsigned
if (len > 0) {
digit |= 0x80;
}
lenBuf[pos++] = digit;
buffer[pos++] = digit;
llen++;
} while(len>0);
rc += _client->write(&header, 1);
rc += _client->write(lenBuf, llen);
pos = writeString(topic,buffer,pos);
lenBuf[0] = tlen >> 8; // MSB
lenBuf[1] = tlen & 0xFF; // LSB
rc += _client->write(lenBuf, 2);
rc += _client->write((uint8_t *)topic, tlen);
rc += _client->write(buffer,pos);
for (i=0;i<plength;i++) {
rc += _client->write((char)pgm_read_byte_near(payload + i));
@ -279,9 +279,12 @@ boolean PubSubClient::write(uint8_t header, uint8_t* buf, uint16_t length) {
llen++;
} while(len>0);
rc = _client->write(header);
rc += _client->write(lenBuf,llen);
rc += _client->write(buf,length);
buf[4-llen] = header;
for (int i=0;i<llen;i++) {
buf[5-llen+i] = lenBuf[i];
}
rc = _client->write(buf+(4-llen),length+1+llen);
lastOutActivity = millis();
return (rc == 1+llen+length);
}
@ -289,26 +292,27 @@ boolean PubSubClient::write(uint8_t header, uint8_t* buf, uint16_t length) {
boolean PubSubClient::subscribe(char* topic) {
if (connected()) {
uint16_t length = 2;
// Leave room in the buffer for header and variable length field
uint16_t length = 7;
nextMsgId++;
if (nextMsgId == 0) {
nextMsgId = 1;
}
buffer[0] = nextMsgId >> 8;
buffer[1] = nextMsgId - (buffer[0]<<8);
buffer[0] = (nextMsgId >> 8);
buffer[1] = (nextMsgId & 0xFF);
length = writeString(topic, buffer,length);
buffer[length++] = 0; // Only do QoS 0 subs
return write(MQTTSUBSCRIBE|MQTTQOS1,buffer,length);
return write(MQTTSUBSCRIBE|MQTTQOS1,buffer,length-5);
}
return false;
}
void PubSubClient::disconnect() {
_client->write(MQTTDISCONNECT);
_client->write((uint8_t)0);
buffer[0] = MQTTDISCONNECT;
buffer[1] = 0;
_client->write(buffer,2);
_client->stop();
lastInActivity = millis();
lastOutActivity = millis();
lastInActivity = lastOutActivity = millis();
}
uint16_t PubSubClient::writeString(char* string, uint8_t* buf, uint16_t pos) {
@ -319,8 +323,8 @@ uint16_t PubSubClient::writeString(char* string, uint8_t* buf, uint16_t pos) {
buf[pos++] = *idp++;
i++;
}
buf[pos-i-2] = 0;
buf[pos-i-1] = i;
buf[pos-i-2] = (i >> 8);
buf[pos-i-1] = (i & 0xFF);
return pos;
}