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Fixed packet reading issue in PubSubClient.readPacket

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This commit is contained in:
Nicholas O'Leary 2010-02-27 21:37:58 +00:00
parent 265016844b
commit f8a977ddd0
1 changed files with 7 additions and 3 deletions
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10
PubSubClient.cpp
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@ -13,7 +13,6 @@
#define MQTTPUBLISH 3<<4
#define MQTTSUBSCRIBE 8<<4
PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, void (*callback)(char*,uint8_t*,int)) : _client(ip,port) {
this->callback = callback;
}
@ -37,7 +36,7 @@ int PubSubClient::connect(char *id, char* willTopic, uint8_t willQos, uint8_t wi
buffer[length++] = 0x02;
}
buffer[length++] = 0;
buffer[length++] = (KEEPALIVE/500);
buffer[length++] = (KEEPALIVE/1000);
length = writeString(id,buffer,length);
if (willTopic) {
length = writeString(willTopic,buffer,length);
@ -46,6 +45,7 @@ int PubSubClient::connect(char *id, char* willTopic, uint8_t willQos, uint8_t wi
write(MQTTCONNECT,buffer,length);
while (!_client.available()) {}
uint8_t len = readPacket();
if (len == 4 && buffer[3] == 0) {
lastActivity = millis();
return 1;
@ -59,12 +59,13 @@ int PubSubClient::connect(char *id, char* willTopic, uint8_t willQos, uint8_t wi
uint8_t PubSubClient::readPacket() {
uint8_t len = 0;
while (!_client.available()) {}
buffer[len++] = _client.read();
uint8_t multiplier = 1;
uint8_t length = 0;
uint8_t digit = 0;
do {
while (!_client.available()) {}
digit = _client.read();
buffer[len++] = digit;
length += (digit & 127) * multiplier;
@ -74,12 +75,15 @@ uint8_t PubSubClient::readPacket() {
for (int i = 0;i<length;i++)
{
if (len < MAX_PACKET_SIZE) {
while (!_client.available()) {}
buffer[len++] = _client.read();
} else {
while (!_client.available()) {}
_client.read();
len = 0; // This will cause the packet to be ignored.
}
}
return len;
}