First, connect each flight controller separately to qgroundcontrol and ensure that they have distinct mavlink system IDs. Then, ensure that you have a telemetry radio setup that supports two separate flight controllers. For example, you could connect QGroundControl to two separate telemetry radios, and ensure that those two separate radios can connect to your two different flight controllers by matching the channel configuration.
To make this easier, some folks use an intermediate telemetry relay on the ground that has multiple telemetry radios attached, and forwards the mavlink traffic to qgroundcontrol using UDP. We use a custom solution called mavgent that does this.
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First, connect each flight controller separately to qgroundcontrol and ensure that they have distinct mavlink system IDs. Then, ensure that you have a telemetry radio setup that supports two separate flight controllers. For example, you could connect QGroundControl to two separate telemetry radios, and ensure that those two separate radios can connect to your two different flight controllers by matching the channel configuration.
To make this easier, some folks use an intermediate telemetry relay on the ground that has multiple telemetry radios attached, and forwards the mavlink traffic to qgroundcontrol using UDP. We use a custom solution called mavgent that does this.