Avoid re-opening connections after they're closed

packages/net/src/target/Echo.ts

@@ -6,7 +6,7 @@ export class Echo extends Emitter {
     return []
   }
 
-  send(...payload: Message) {
+  async send(...payload: Message) {
     this.emit(...payload)
   }
 

packages/net/src/target/Local.ts

@@ -13,8 +13,8 @@ export class Local extends Emitter {
     return []
   }
 
-  send(...payload: Message) {
-    this.relay.send(...payload)
+  async send(...payload: Message) {
+    await this.relay.send(...payload)
   }
 
   onMessage = (...message: Message) => {

packages/net/src/target/Multi.ts

@@ -15,8 +15,8 @@ export class Multi extends Emitter {
     return this.targets.flatMap(t => t.connections)
   }
 
-  send(...payload: Message) {
-    this.targets.forEach(t => t.send(...payload))
+  async send(...payload: Message) {
+    await Promise.all(this.targets.map(t => t.send(...payload)))
   }
 
   cleanup = () => {

packages/net/src/target/Relay.ts

@@ -14,8 +14,8 @@ export class Relay extends Emitter {
     return [this.connection]
   }
 
-  send(...payload: Message) {
-    this.connection.send(payload)
+  async send(...payload: Message) {
+    await this.connection.send(payload)
   }
 
   onMessage = (connection: Connection, [verb, ...payload]: Message) => {

packages/net/src/target/Relays.ts

@@ -12,10 +12,8 @@ export class Relays extends Emitter {
     })
   }
 
-  send = (...payload: Message) => {
-    this.connections.forEach(connection => {
-      connection.send(payload)
-    })
+  async send(...payload: Message) {
+    await Promise.all(this.connections.map(c => c.send(payload)))
   }
 
   onMessage = (connection: Connection, [verb, ...payload]: Message) => {