What protocol count as data for the SIM Card.

[QBeauchet]

Hello, for our project my team would like to know exactly what is considered data for the SIM. We are still using the prepaid Ibasis SIM card given with our nRF9160DK and we need to know at which point is it considered data that will count as the SIM usage.
Using Wireshark we can see that a lot of protocols are used. At which point is it considered as data ?

AT
LTE RCC DL_SCH
NAS-EPS
LTE RCC UL_CCCH
LTE RCC DL_CCCH
LTE RCC UL_CCCH/NAS-EPS
LTE RCC DL_CCCH/NAS-EPS
DNS
TCP
MQTT

mqtt_working_3.pcapng

Thanks for the incoming help.

[Achim Kraus]

At least DNS, TCP, MQTT. And it's the "on wire" amount.

e.g. MQTT Connect Ack => 4 Bytes MQTT => +20 Bytes TCP header + 20 Bytes IP header.

About the 12 bytes exported PDU , I'm not sure, but I guess it's included. And sometimes you get TCP retransmissions, which are also counted.

For UDP based protocols you save the "TCP only" extra messages, e.g. TCP SYN / TCP ACK. Retransmission are handled in the UDP case by upper layer protocols as CoAP. If you chose a implementation, which enables you to relax the transmission timeouts, you will also be able to reduce the retransmissions. Using "radio" transmission frequently delivers the message, but a little too late. That cause therefore frequently retransmissions. If you relax that timeout, the retransmission will occur less,.

The nRF9160 has also a function called AT%XCONNSTAT? which reports matching numbers for the data consumption.