[Plugin: BuddyPress] Admin Bar Function – Bp Root not Network Home- PHP

For a BuddyPress Site I have a function for putting “Groups”, or other menu items in the wp-admin bar.

This is it

function bcustom_adminbar_menu() {
	global $wp_admin_bar;
		if ( !is_user_logged_in() ) { return; }
	$wp_admin_bar->add_menu( array(
		'id' => 'bcustom_menu',
		'title' => __( 'Groups' ),
		'href' => network_home_url('/groups/')
		 )
	);
}
add_action( 'admin_bar_menu', 'bcustom_adminbar_menu', 15 );

However if the bp root blog is not the network home then the function is incorrect.

Could somebody please help me to change the line

'href' => network_home_url('/groups/')

so that it goes to or is equivalent to

<a href="<?php echo get_blog_option( BP_ROOT_BLOG, 'siteurl') ?>/groups/">Groups</a>

Thanks.

https://www.ads-software.com/extend/plugins/buddypress/