experiments with Pylontech/GroWatt PV tech
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#ifndef ntp_time_h
#define ntp_time_h
#include <WiFiUdp.h>
// NTP Servers:
static const char ntpServerName[] = "0.uk.pool.ntp.org"; const int timeZone = 0; unsigned int localPort = 8888; // local port to listen for UDP packets
/*-------- NTP code ----------*/
const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message
byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming & outgoing packets
WiFiUDP udpNtp;
// send an NTP request to the time server at the given address
void sendNTPpacket(IPAddress &address) { // set all bytes in the buffer to 0
memset(packetBuffer, 0, NTP_PACKET_SIZE); // Initialize values needed to form NTP request
// (see URL above for details on the packets)
packetBuffer[0] = 0b11100011; // LI, Version, Mode
packetBuffer[1] = 0; // Stratum, or type of clock
packetBuffer[2] = 6; // Polling Interval
packetBuffer[3] = 0xEC; // Peer Clock Precision
// 8 bytes of zero for Root Delay & Root Dispersion
packetBuffer[12] = 49; packetBuffer[13] = 0x4E; packetBuffer[14] = 49; packetBuffer[15] = 52; // all NTP fields have been given values, now
// you can send a packet requesting a timestamp:
udpNtp.beginPacket(address, 123); //NTP requests are to port 123
udpNtp.write(packetBuffer, NTP_PACKET_SIZE); udpNtp.endPacket(); }
time_t getNtpTime() { if(WiFi.status() != WL_CONNECTED) { return 0; } static bool udpStarted = false; if(udpStarted == false) { udpStarted = true; udpNtp.begin(localPort); } IPAddress ntpServerIP; // NTP server's ip address
while (udpNtp.parsePacket() > 0) ; // discard any previously received packets
// get a random server from the pool
WiFi.hostByName(ntpServerName, ntpServerIP); sendNTPpacket(ntpServerIP); delay(100); uint32_t beginWait = millis(); while (millis() - beginWait < 1500) { int size = udpNtp.parsePacket(); if (size >= NTP_PACKET_SIZE) { udpNtp.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer
unsigned long secsSince1900; // convert four bytes starting at location 40 to a long integer
secsSince1900 = (unsigned long)packetBuffer[40] << 24; secsSince1900 |= (unsigned long)packetBuffer[41] << 16; secsSince1900 |= (unsigned long)packetBuffer[42] << 8; secsSince1900 |= (unsigned long)packetBuffer[43]; return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR; }
delay(10); } return 0; // return 0 if unable to get the time
} #endif //ntp_time_h
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