# Read meta-information from ACK-Packet (Arduino LMIC)

**URL:** <https://www.thethingsnetwork.org/forum/t/read-meta-information-from-ack-packet-arduino-lmic/35935>\
**Category:** LMIC\
**Created:** [April 5, 2020, 6:25pm UTC](https://www.thethingsnetwork.org/forum/t/read-meta-information-from-ack-packet-arduino-lmic/35935 "2020-04-05T18:25:35Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Ludwig](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/ludwig/32/25844_2.png) [@Ludwig](https://www.thethingsnetwork.org/forum/u/Ludwig)\
**Post date:** [April 6, 2020, 7:14am UTC](https://www.thethingsnetwork.org/forum/t/read-meta-information-from-ack-packet-arduino-lmic/35935/2 "2020-04-06T07:14:14Z")

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Hi,  
see [RadioDriver.md](https://github.com/mcci-catena/arduino-lmic/blob/master/doc/RadioDriver.md) which describes the fields LMIC.snr, LMIC.rssi, LMIC.rps and LMIC.freq which hold these information. They can be accessed in the event handler for a `EV_TXCOMPLETE` event. As I have not tested this before, I can not guarantee that this works.  
Also the rx channel is predtermined, see [here](https://www.thethingsnetwork.org/forum/t/configure-downlink-frequency-of-a-gateway/4038/2) for example.

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