nRF9160 Modem Maximum number of packets that can be cached when sending over TCP

[Harvey Zheng]

Hi, I would like to know the maximum number of packets that the 9160 modem can cache when sending over TCP. Also, is there any documentation on the 9160 modem?

Thanks!

[Didrik Rokhaug]

Hi,

May I ask why you want to know this?

If the buffer in the modem is full, a call to send() will block, until there is enough space available.

 Also, is there any documentation on the 9160 modem?

What exactly are you looking for?

You can find some documentation here: https://infocenter.nordicsemi.com/topic/ps_nrf9160/ip/radio_lte/doc/frontpage.html

There is also some information in the AT command guide: https://infocenter.nordicsemi.com/topic/ref_at_commands/REF/at_commands/intro.html

The documentation for the modem library also covers some of the features of the modem itself: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.3.0/nrfxlib/nrf_modem/README.html

Best regards,

Didrik

[Harvey Zheng]

Didrik Rokhaug said:

May I ask why you want to know this?

If the buffer in the modem is full, a call to send() will block, until there is enough space available.

Hi,

Because I don't want the send() interface to be blocked, i.e. the TCP cache is not used up. I am using MQTT to publish data and wait for an ACK. I would like to publish several packets of data before waiting for an ACK so that I can make maximum use of the TCP cache.