aeron-client/src/main/java/io/aeron/ChannelUri.java
public String put(final String key, final String value)
    {
        return params.put(key, value);
    }
public String put(final String key, final String value)
    {
        return params.put(key, value);
    }
Put a key and value pair in the map of params.

@param key   of the param to be put.
@param value of the param to be put.
@return the existing value otherwise null.