Configuring Two LoRa Cards on a Conduit

Two LoRa cards can be installed on the same Conduit for the use cases listed below. Additional configuration is required.

Important: The Conduit must be version MTCDT-24x or greater with MTAC-LORA-1.5 accessory cards. You cannot install two LoRa accessory cards on earlier versions of the Conduit.

SPI Device paths:

Set config key in “gateway_conf” section for each card. This will link the configuration to each physical card. If not supplied the default spi0.0 device in AP1 will be used.
AP1 => “spi_device”: “/dev/spidev32766.2″
AP2 => “spi_device”: “/dev/spidev32765.2″

Example Configurations

Packet forwarder configuration file examples can be found at the following links:

 

Diversity 8-channel operation

Run two packet forwarder instances with identical channel configurations. Make sure that the gateway_ID setting is changed for each card.

  • Card 1 – 902.3-903.7=>Radio 0 : 902.7 Radio 1: 903.5
  • Card 2 – 902.3-903.7=>Radio 0 : 902.7 Radio 1: 903.5

16-channel operation

 Run two packet forwarder instances with offset channel configurations. Make sure that the gateway_ID setting is changed for each card.

  • Card 1 – 902.3-903.7=>Radio 0 : 902.7 Radio 1: 903.5
  • Card 2 – 903.9-905.3=>Radio 0 : 904.3 Radio 1: 905.1

If you choose frequency subband 1 and 8 for card 1 and card 2 respectively, then the configurations are:

  • Card 1: frequency subband 1: radio_0: 902700000 ,radio_1: 903500000
  • Card 2: frequency subband 8: radio_0: 913900000, radio_1: 914700000

Reference modifications for AEP using angel process to monitor/restart packet forwarder

Init Script
Global Config

  • Disable network-server changing enabled in /etc/default/lora-network-server to “no”
  • Enable packet forwarder changing enabled in /etc/default/lora-packet-forwarder to “yes”
  • Copy init script to /etc/init.d/lora-packet-forwarder
  • Copy global config to /var/config/lora/global_conf_1.json and /var/config/lora/global_conf_2.json
  • Change global_conf_1.json and global_conf_2.json radio_0 and radio_1 as desired FSB1:902.7/903.5 FSB2:904.3/905.1