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Subscriptions are formed from two channels from two different Picos. Each channel has a corresponding Eci stored for the other Picos channel.
From each pico's perspective there is an incoming channel and an outgoing channel. The pico receives events and queries from the other pico in the subscriptions over the incoming channel and makes queries and sends events to the other pico using the outgoing channel.
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Upon receiving a wrangler:subscription_removal event, the pico deletes the named subscription from the inbound or outbound subscriptions list as appropriate.
Initial Subscription Flow
Subscription Approval Flow
Subscription Rejection Flow
