Update PubSubClient.cpp
added yield to resolve random connection failure
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@ -209,6 +209,7 @@ boolean PubSubClient::connect(const char *id, const char *user, const char *pass
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boolean PubSubClient::readByte(uint8_t * result) {
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boolean PubSubClient::readByte(uint8_t * result) {
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uint32_t previousMillis = millis();
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uint32_t previousMillis = millis();
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while(!_client->available()) {
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while(!_client->available()) {
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yield();
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uint32_t currentMillis = millis();
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uint32_t currentMillis = millis();
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if(currentMillis - previousMillis >= ((int32_t) MQTT_SOCKET_TIMEOUT * 1000)){
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if(currentMillis - previousMillis >= ((int32_t) MQTT_SOCKET_TIMEOUT * 1000)){
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return false;
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return false;
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