Confusing minimum poll interval setting

[cimm]

The LoraSendAndReceive example sketch uses the minPollInterval() function but I can't seem to find any documentation for this function.

modem.minPollInterval(60);
// NOTE: independently by this setting the modem will
// not allow to send more than one message every 2 minutes,
// this is enforced by firmware and can not be changed.

This only sets the pollInterval variable if I read the source correctly so why does the example set it to 60 seconds when the comment underneath states it can't be less than 2 minutes? Shouldn't it be minimum 120 seconds?

Thank you!

[facchinm]

Hi @cimm ,
minPollInterval was added to wrap an AT command from original Murata firmware; as you correctly noticed it is currently unused and can be removed.

[matthijskooijman]

minPollInterval was added to wrap an AT command from original Murata firmware; as you correctly noticed it is currently unused and can be removed.

I'm a bit confused, as the pollInterval variable (set byy minPollInterval) does seem to be used here:

MKRWAN/src/MKRWAN.h

Line 657 in 2ca8398

if (millis() - lastPollTime < pollInterval) return;

Or did you mean that the entire poll() function can be removed? Its function is not documented, but it looks a bit like it is intended to check network connectivity by sending a dummy (but not entirely empty) confirmed uplink?

[matthijskooijman]

Its function is not documented, but it looks a bit like it is intended to check network connectivity by sending a dummy (but not entirely empty) confirmed uplink?

Though it seems the poll() function does not return the status of the confirmed upllink, so maybe it is intended for something else. I initially thought it would send an uplink to give the network a chance to send a downlink (i.e. poll for a pending downlink), but then it makes no sense that it uses a confirmed uplink (though maybe it does so to ensure blocking until the RX window is completed and also knowing for sure whether a message is pending or not)?