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Added method to set random local port

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Added method to set a random local port, so that the board needs not
to use always the same embedded local port for receiving NTP packets.
This commit is contained in:
Luigi Gubello 2020-08-31 02:25:05 +02:00
parent 894b21de11
commit a8bdae7ca4
2 changed files with 16 additions and 5 deletions
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12
NTPClient.cpp
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@ -73,7 +73,7 @@ void NTPClient::begin() {
this->begin(NTP_DEFAULT_LOCAL_PORT);
}
void NTPClient::begin(int port) {
void NTPClient::begin(long port) {
this->_port = port;
this->_udp->begin(this->_port);
@ -120,7 +120,7 @@ bool NTPClient::forceUpdate() {
bool NTPClient::update() {
if ((millis() - this->_lastUpdate >= this->_updateInterval) // Update after _updateInterval
|| this->_lastUpdate == 0) { // Update if there was no update yet.
if (!this->_udpSetup) this->begin(); // setup the UDP client if needed
if (!this->_udpSetup || this->_port != NTP_DEFAULT_LOCAL_PORT) this->begin(this->_port); // setup the UDP client if needed
return this->forceUpdate();
}
return false; // return false if update does not occur
@ -181,7 +181,8 @@ void NTPClient::sendNTPPacket() {
// set all bytes in the buffer to 0
memset(this->_packetBuffer, 0, NTP_PACKET_SIZE);
// Initialize values needed to form NTP request
// (see URL above for details on the packets)
// (see URL above for details on the packets) Serial.println(this->_port);
this->_packetBuffer[0] = 0b11100011; // LI, Version, Mode
this->_packetBuffer[1] = 0; // Stratum, or type of clock
this->_packetBuffer[2] = 6; // Polling Interval
@ -202,3 +203,8 @@ void NTPClient::sendNTPPacket() {
this->_udp->write(this->_packetBuffer, NTP_PACKET_SIZE);
this->_udp->endPacket();
}
void NTPClient::setRandomPort() {
randomSeed(analogRead(0));
this->_port = random(1, 65534);
}

9
NTPClient.h
View File

@ -15,7 +15,7 @@ class NTPClient {
const char* _poolServerName = "pool.ntp.org"; // Default time server
IPAddress _poolServerIP;
int _port = NTP_DEFAULT_LOCAL_PORT;
long _port = NTP_DEFAULT_LOCAL_PORT;
long _timeOffset = 0;
unsigned long _updateInterval = 60000; // In ms
@ -44,6 +44,11 @@ class NTPClient {
*/
void setPoolServerName(const char* poolServerName);
/**
* Set random local port
*/
void setRandomPort();
/**
* Starts the underlying UDP client with the default local port
*/
@ -52,7 +57,7 @@ class NTPClient {
/**
* Starts the underlying UDP client with the specified local port
*/
void begin(int port);
void begin(long port);
/**
* This should be called in the main loop of your application. By default an update from the NTP Server is only