Error -304 in writeFields()

Hi,

I am sending environmental data (float) once every 30 minutes from a NodeMCU, so the speed rate is low. Since a couple of months I am experiencing 3-5 errors a day, returning code -304 (Timeout waiting for server to respond) or -301.

I am sending data with this code (very straight-forward):

ThingSpeak.setField( 1, t );
ThingSpeak.setField( 2, h );
ThingSpeak.setField( 3, p );
ThingSpeak.setField( 4, vdd );
int writeSuccess = ThingSpeak.writeFields( myChannelNumber, myWriteAPIKey );

Then I realized that the device was connected to the WIFi extender. If I connect it to the main router (Fritz 7490) WiFi, it does not incur in those errors.

The extender is a NetGear EX7500, with no choice of special settings other than standard WiFi configuration.

What could be the problem?

Answer 1

[Vinod]

I believe you have isolated the problem to your Netgear extender. The symptoms point to a delay of some sort that the extender introduces that causes the write request to time out.

Your best bet is to reach out to netgear to understand the source of the problem. Maybe your extender needs a periodic "keep alive" packet going to ensure that it stays connected to your router?

[Fabio Marzocca]

Hi Vinod,

I have tried reaching NetGear support few days ago, but they don't even understanf the problem, so I gave up with them.

Thanks anyway!

[Christopher Stapels]

Is it possible that the extender is placed too far from the hub so that the extender has a poor network conncetion itself? Then it would fail to extend or repeat the network if it could not stay connected itself.

[Fabio Marzocca]

Unfortunately not, because I am using it the whole day with a lot of other devices (computer, SmartTV, smartphones, radio streaming, etc...).