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2020-01-09 at 3:24 PM
#13584
Oh, and yes, the issue with NIST is really common. There have been a few GitHub issues about it. I’m trying to connect over TCP to the daytime server. That server is designed to respond to an
Oh, and yes, the issue with NIST is really common. There have been a few GitHub issues about it. I’m trying to connect over TCP to the daytime server. That server is designed to respond to any incoming connection on port 37 with 4 bytes representing the current timestamp and immediately close the connection. A lot of the time the various modems see the connection as closed before they’ve had a chance to tell you that any data was received. So I wait 4 seconds (as required by NIST) and try again, up to 5 times.
It would be much more efficient (and accurate) to connect to a proper NTP (network time protocol) server and get the time that way. But NTP is run over UDP and I don’t know of any libraries that support both TCP and UDP connections on more than 1 single device type the way that TinyGSM does for TCP. With TinyGSM, it’s only a few lines of code to switch from a 2G to 3G to 4G to wifi connection. It’s on my to-do list to implement full UDP support in TinyGSM, but I have no timeframe for it happening.
