Lora-gateway-bridge generic Mqtt integration

Dear all ;
I’m quite new to loraserver, trying to integrate lora-gateway-bridge with a 3rd party.
The documentation says that in Class A, it is possible to integrate lora-gateway-bridge via generic MQTT.
But how will the timing issues handled by the 3rd party in Class A since “context” contains timing details?
Can the 3rd party broadcast MQTT directly to lora-gateway-bridge and accomplish a successful downlink?
Thank you.