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How should the Foreign_Relay package be used ? I cant find any documentation

I could not find how the foreign_relay package should be used in ROS .

I want to use it since ,its very light weight compared to multimaster module.

Can someone help with the documentation link ?

Also I had the below question ,

i understand foreign relay can be used for only one topic transfer ,can i have multiple foreign relays running if i want more than one topic to be send to other master .

How should the Foreign_Relay package be used ? I cant find any documentation

I could not find how the foreign_relay package should be used in ROS .

I want to use it since ,its very light weight compared to multimaster module.

Can someone help with the documentation link ?

Also I had the below question ,

i understand foreign relay can be used for only one topic transfer ,can i have multiple foreign relays running if i want more than one topic to be send to other master .

update 31.10.2018:it is working now ,i am able to send ROS mesages between ros master .USAGE: foreign_relay {adv|sub} FOREIGN_MASTER_URI FOREIGN_TOPIC LOCAL_TOPIC.if i use {adv},the 2nd ROS master gets the message from the first ,but if i run sub(alone) to get the message from master 2 ,it does not work. can you please let me know how the adv and sub works ?? it looks like if i use adv i can publish message to the 2nd ROS master without {sub} in the 2nd master .but if i use sub alone in the 2nd master to get message from 1st master it doesnt work . any leads ?