Constant FM_IROH_CONNECT_OVERRIDES_PLAIN_ENV 

pub const FM_IROH_CONNECT_OVERRIDES_PLAIN_ENV: &str = "FM_IROH_CONNECT_OVERRIDES_PLAIN";

Env var to override iroh connectivity, in the plain <id>=<addr> format.

Comma separated key-value list (<node_id>=<socket_addr>,...). The value is a single direct address; the consumer rebuilds the iroh node/endpoint address from the id and address, so the format works on both iroh 0.35 and iroh 1.0. Current binaries read this; pre-0.12 binaries read the legacy FM_IROH_CONNECT_OVERRIDES_ENV instead.