Filter unwanted LoRaWAN packets
Table of Contents:
1. Introduction
This feature is to filter the unwanted LoRaWAN packets. Purpose is to save the upstream traffic especially for a 4G cellular connection. If configured, gateway will process filter for below two types of message:
- Unconfirmed Data Up
- Confirmed Data Up
2. FWD Filter Mechanism
Support Devices:
- Firmware Version > dragino-lgw--v5.4.1658822655
- LG308, DLOS8, LPS8, LIG16, LG308N, DLOS8N, LPS8N
Filtering rules:
| Fport Filter | DevAddr Filter | ||
|---|---|---|---|
| Level 0 | Do nothing | Level 0 | Do nothing |
| Level 1 | Filter only the Fport in the list | Level 1 | Filter only the DevAddr in the list |
| Level 2 | Filter Fport that are not in the database | Level 2 | Filter DevAddr that are not in the database |
Check if the filter is running
2.1 Filter By Fport
The Gateway FPort filter will check all the below LoRaWAN messages: Unconfirmed Data Up & Confirmed Data Up.
Important Notice:
- By default, Fport Filter Level=0. which means do nothing
- Fport Filter configured to Level=1. If the Fport in the list matches the Fport received by the gateway, it will be dropped.
- Fport Filter configured to Level=2. If the Fport in the list does not match the Fport received by the gateway, it will be dropped.
In this case, we set Fport Filter Level=0 and add the fileter (server | fport | 0), when the gateway receives a Lorawan packet with Fport=0, it will be dropped.
2.2 Filter By DevAddr
The Gateway FPort filter will check all the below LoRaWAN messages: Unconfirmed Data Up & Confirmed Data Up.
Important Notice:
- By default, DevAddr Filter Level=0. which means do nothing
- DevAddr Filter configured to Level=1. If the DevAddr in the list matches the DevAddr received by the gateway, it will be dropped.
- DevAddr Filter configured to Level=2. If the DevAddr in the list does not match the DevAddr received by the gateway, it will be dropped.
In this case, we set DevAddr Filter Level=0 and add the filter (server | DevAddr | 12664787 ), when the gateway receives a Lorawan packet with DevAddr=12664787, it will be dropped.
If user need to set the Secondary LoRaWAN Server Packet Filter, the configuration is similar to that above.
3. PKT_FWD Filter Mechanism
Support Devices:
- Firmware Version > lgw--build-v5.4.1602379434-20201011-0926 Firmware Download
- LG308, DLOS8
- LPS8
Fport & DevAddr Filter
Check if the filter is running
3.1 Filter By Fport
The Gateway FPort filter will check all the below LoRaWAN message: Unconfirmed Data Up & Confirmed Data Up. If the packet's FPort doesn't match the FPort setting, it will be dropped.
By default , this value is 0 means can upstream all packets with any FPort. We can set to other FPort so specify only one FPort works.
In case we set the FPort filter to 45, and the End Node send a packet with Fport other than 45, it will be dropped.
3.2 Filter By DevAddr
Gateway will use a DevAddr mask to check if the Unconfirmed Data Up & Confirmed Data Up packets match the mask . If not, gateway will drop it.
This screenshot shows packets is dropped if DevAddr mask doesn't match.