diff --git a/ecdh.go b/ecdh.go
index 0297f13..9fda69d 100644
--- a/ecdh.go
+++ b/ecdh.go
@@ -106,7 +106,7 @@ func (ext *ECDHExt) Field(name string) interface{} {
 func (ext *ECDHExt) HandleECDHSignal(ctx *Context, source NodeID, node *Node, signal ECDHSignal) {
   ser, _ := signal.Serialize()
   ctx.Log.Logf("ecdh", "ECDH_SIGNAL: %s->%s - %s", source, node.ID, ser)
-  switch signal.State {
+  switch signal.Str {
   case "req":
     state, exists := ext.ECDHStates[source]
     if exists == false {
@@ -125,7 +125,7 @@ func (ext *ECDHExt) HandleECDHSignal(ctx *Context, source NodeID, node *Node, si
   case "resp":
     state, exists := ext.ECDHStates[source]
     if exists == false || state.ECKey == nil {
-      ctx.Send(node.ID, source, StateSignal{NewDirectSignal(ECDHStateSignalType), "no_req"})
+      ctx.Send(node.ID, source, StringSignal{NewDirectSignal(ECDHStateSignalType), "no_req"})
     } else {
       err := VerifyECDHSignal(time.Now(), signal, DEFAULT_ECDH_WINDOW)
       if err == nil {
@@ -139,11 +139,11 @@ func (ext *ECDHExt) HandleECDHSignal(ctx *Context, source NodeID, node *Node, si
       }
     }
   default:
-    ctx.Log.Logf("ecdh", "unknown echd state %s", signal.State)
+    ctx.Log.Logf("ecdh", "unknown echd state %s", signal.Str)
   }
 }
 
-func (ext *ECDHExt) HandleStateSignal(ctx *Context, source NodeID, node *Node, signal StateSignal) {
+func (ext *ECDHExt) HandleStateSignal(ctx *Context, source NodeID, node *Node, signal StringSignal) {
   ser, _ := signal.Serialize()
   ctx.Log.Logf("ecdh", "ECHD_STATE: %s->%s - %s", source, node.ID, ser)
 }
@@ -151,13 +151,13 @@ func (ext *ECDHExt) HandleStateSignal(ctx *Context, source NodeID, node *Node, s
 func (ext *ECDHExt) HandleECDHProxySignal(ctx *Context, source NodeID, node *Node, signal ECDHProxySignal) {
   state, exists := ext.ECDHStates[source]
   if exists == false {
-    ctx.Send(node.ID, source, StateSignal{NewDirectSignal(ECDHStateSignalType), "no_req"})
+    ctx.Send(node.ID, source, StringSignal{NewDirectSignal(ECDHStateSignalType), "no_req"})
   } else if state.SharedSecret == nil {
-    ctx.Send(node.ID, source, StateSignal{NewDirectSignal(ECDHStateSignalType), "no_shared"})
+    ctx.Send(node.ID, source, StringSignal{NewDirectSignal(ECDHStateSignalType), "no_shared"})
   } else {
     unwrapped_signal, err := ParseECDHProxySignal(ctx, &signal, state.SharedSecret)
     if err != nil {
-      ctx.Send(node.ID, source, StateSignal{NewDirectSignal(ECDHStateSignalType), err.Error()})
+      ctx.Send(node.ID, source, StringSignal{NewDirectSignal(ECDHStateSignalType), err.Error()})
     } else {
       //TODO: Figure out what I was trying to do here and fix it
       ctx.Send(signal.Source, signal.Dest, unwrapped_signal)
@@ -173,7 +173,7 @@ func (ext *ECDHExt) Process(ctx *Context, source NodeID, node *Node, signal Sign
       ecdh_signal := signal.(ECDHProxySignal)
       ext.HandleECDHProxySignal(ctx, source, node, ecdh_signal)
     case ECDHStateSignalType:
-      ecdh_signal := signal.(StateSignal)
+      ecdh_signal := signal.(StringSignal)
       ext.HandleStateSignal(ctx, source, node, ecdh_signal)
     case ECDHSignalType:
       ecdh_signal := signal.(ECDHSignal)
diff --git a/gql.go b/gql.go
index e7607f9..c29f52f 100644
--- a/gql.go
+++ b/gql.go
@@ -996,20 +996,20 @@ func (ext *GQLExt) Process(ctx *Context, source NodeID, node *Node, signal Signa
       ctx.Log.Logf("gql", "Received read result that wasn't expected - %+v", sig)
     }
   } else if signal.Type() == GQLStateSignalType {
-    sig := signal.(StateSignal)
-    switch sig.State {
+    sig := signal.(StringSignal)
+    switch sig.Str {
     case "start_server":
       err := ext.StartGQLServer(ctx, node)
       if err == nil {
-        ctx.Send(node.ID, source, StateSignal{NewDirectSignal(GQLStateSignalType), "server_started"})
+        ctx.Send(node.ID, source, StringSignal{NewDirectSignal(GQLStateSignalType), "server_started"})
       }
     case "stop_server":
       err := ext.StopGQLServer()
       if err == nil {
-        ctx.Send(node.ID, source, StateSignal{NewDirectSignal(GQLStateSignalType), "server_stopped"})
+        ctx.Send(node.ID, source, StringSignal{NewDirectSignal(GQLStateSignalType), "server_stopped"})
       }
     default:
-      ctx.Log.Logf("gql", "unknown gql state %s", sig.State)
+      ctx.Log.Logf("gql", "unknown gql state %s", sig.Str)
     }
   }
 }
diff --git a/gql_test.go b/gql_test.go
index 5c64ad7..cdeddf9 100644
--- a/gql_test.go
+++ b/gql_test.go
@@ -25,15 +25,15 @@ func TestGQL(t *testing.T) {
   listener_ext := NewListenerExt(10)
   policy := NewAllNodesPolicy(Actions{MakeAction("+")})
   gql := NewNode(ctx, nil, GQLNodeType, 10, []QueuedSignal{
-    QueuedSignal{uuid.New(), StateSignal{NewDirectSignal(GQLStateSignalType), "start_server"}, time.Now()},
+    QueuedSignal{uuid.New(), StringSignal{NewDirectSignal(GQLStateSignalType), "start_server"}, time.Now()},
   }, NewLockableExt(), NewACLExt(policy), gql_ext, NewGroupExt(nil), listener_ext)
   n1 := NewNode(ctx, nil, TestNodeType, 10, nil, NewLockableExt(), NewACLExt(policy))
 
   err = LinkRequirement(ctx, gql.ID, n1.ID)
   fatalErr(t, err)
 
-  _, err = WaitForSignal(ctx, listener_ext, 100*time.Millisecond, GQLStateSignalType, func(sig StateSignal) bool {
-    return sig.State == "server_started"
+  _, err = WaitForSignal(ctx, listener_ext, 100*time.Millisecond, GQLStateSignalType, func(sig StringSignal) bool {
+    return sig.Str == "server_started"
   })
   fatalErr(t, err)
 
@@ -82,9 +82,9 @@ func TestGQL(t *testing.T) {
   resp_2 := SendGQL(req_2)
   ctx.Log.Logf("test", "RESP_2: %s", resp_2)
 
-  ctx.Send(n1.ID, gql.ID, StateSignal{NewDirectSignal(GQLStateSignalType), "stop_server"})
-  _, err = WaitForSignal(ctx, listener_ext, 100*time.Millisecond, GQLStateSignalType, func(sig StateSignal) bool {
-    return sig.State == "server_stopped"
+  ctx.Send(n1.ID, gql.ID, StringSignal{NewDirectSignal(GQLStateSignalType), "stop_server"})
+  _, err = WaitForSignal(ctx, listener_ext, 100*time.Millisecond, GQLStateSignalType, func(sig StringSignal) bool {
+    return sig.Str == "server_stopped"
   })
 }
 
@@ -111,8 +111,8 @@ func TestGQLDB(t *testing.T) {
   err = ctx.Send(gql.ID, gql.ID, StopSignal)
   fatalErr(t, err)
 
-  _, err = WaitForSignal(ctx, listener_ext, 100*time.Millisecond, StatusSignalType, func(sig IDStateSignal) bool {
-    return sig.State == "stopped" && sig.ID == gql.ID
+  _, err = WaitForSignal(ctx, listener_ext, 100*time.Millisecond, StatusSignalType, func(sig IDStringSignal) bool {
+    return sig.Str == "stopped" && sig.ID == gql.ID
   })
   fatalErr(t, err)
 
@@ -129,8 +129,8 @@ func TestGQLDB(t *testing.T) {
   fatalErr(t, err)
   err = ctx.Send(gql_loaded.ID, gql_loaded.ID, StopSignal)
   fatalErr(t, err)
-  _, err = WaitForSignal(ctx, listener_ext, 100*time.Millisecond, StatusSignalType, func(sig IDStateSignal) bool {
-    return sig.State == "stopped" && sig.ID == gql_loaded.ID
+  _, err = WaitForSignal(ctx, listener_ext, 100*time.Millisecond, StatusSignalType, func(sig IDStringSignal) bool {
+    return sig.Str == "stopped" && sig.ID == gql_loaded.ID
   })
   fatalErr(t, err)
 
diff --git a/lockable.go b/lockable.go
index e000bce..b844733 100644
--- a/lockable.go
+++ b/lockable.go
@@ -162,9 +162,9 @@ func LinkRequirement(ctx *Context, dependency NodeID, requirement NodeID) error
 }
 
 // Handle a LockSignal and update the extensions owner/requirement states
-func (ext *LockableExt) HandleLockSignal(ctx *Context, source NodeID, node *Node, signal StateSignal) {
+func (ext *LockableExt) HandleLockSignal(ctx *Context, source NodeID, node *Node, signal StringSignal) {
   ctx.Log.Logf("lockable", "LOCK_SIGNAL: %s->%s %+v", source, node.ID, signal)
-  state := signal.State
+  state := signal.Str
   switch state {
   case "unlock":
     if ext.Owner == nil {
@@ -317,9 +317,9 @@ func (ext *LockableExt) HandleLockSignal(ctx *Context, source NodeID, node *Node
   }
 }
 
-func (ext *LockableExt) HandleLinkStartSignal(ctx *Context, source NodeID, node *Node, signal IDStateSignal) {
+func (ext *LockableExt) HandleLinkStartSignal(ctx *Context, source NodeID, node *Node, signal IDStringSignal) {
   ctx.Log.Logf("lockable", "LINK__START_SIGNAL: %s->%s %+v", source, node.ID, signal)
-  link_type := signal.State
+  link_type := signal.Str
   target := signal.ID
   switch link_type {
   case "req":
@@ -351,9 +351,9 @@ func (ext *LockableExt) HandleLinkStartSignal(ctx *Context, source NodeID, node
 
 // Handle LinkSignal, updating the extensions requirements and dependencies as necessary
 // TODO: Add unlink
-func (ext *LockableExt) HandleLinkSignal(ctx *Context, source NodeID, node *Node, signal StateSignal) {
+func (ext *LockableExt) HandleLinkSignal(ctx *Context, source NodeID, node *Node, signal StringSignal) {
   ctx.Log.Logf("lockable", "LINK_SIGNAL: %s->%s %+v", source, node.ID, signal)
-  state := signal.State
+  state := signal.Str
   switch state {
   case "linked_as_dep":
     state, exists := ext.Requirements[source]
@@ -441,11 +441,11 @@ func (ext *LockableExt) Process(ctx *Context, source NodeID, node *Node, signal
   case Direct:
     switch signal.Type() {
     case LinkSignalType:
-      ext.HandleLinkSignal(ctx, source, node, signal.(StateSignal))
+      ext.HandleLinkSignal(ctx, source, node, signal.(StringSignal))
     case LockSignalType:
-      ext.HandleLockSignal(ctx, source, node, signal.(StateSignal))
+      ext.HandleLockSignal(ctx, source, node, signal.(StringSignal))
     case LinkStartSignalType:
-      ext.HandleLinkStartSignal(ctx, source, node, signal.(IDStateSignal))
+      ext.HandleLinkStartSignal(ctx, source, node, signal.(IDStringSignal))
     default:
     }
   default:
diff --git a/lockable_test.go b/lockable_test.go
index 988429c..bc46a9d 100644
--- a/lockable_test.go
+++ b/lockable_test.go
@@ -40,21 +40,21 @@ func TestLink(t *testing.T) {
   err := LinkRequirement(ctx, l1.ID, l2.ID)
   fatalErr(t, err)
 
-  _, err = WaitForSignal(ctx, l1_listener, time.Millisecond*10, LinkStartSignalType, func(sig IDStateSignal) bool {
-    return sig.State == "linked_as_req"
+  _, err = WaitForSignal(ctx, l1_listener, time.Millisecond*10, LinkStartSignalType, func(sig IDStringSignal) bool {
+    return sig.Str == "linked_as_req"
   })
   fatalErr(t, err)
 
   err = ctx.Send(l2.ID, l2.ID, NewStatusSignal("TEST", l2.ID))
   fatalErr(t, err)
 
-  _, err = WaitForSignal(ctx, l1_listener, time.Millisecond*10, StatusSignalType, func(sig IDStateSignal) bool {
-    return sig.State == "TEST"
+  _, err = WaitForSignal(ctx, l1_listener, time.Millisecond*10, StatusSignalType, func(sig IDStringSignal) bool {
+    return sig.Str == "TEST"
   })
   fatalErr(t, err)
 
-  _, err = WaitForSignal(ctx, l2_listener, time.Millisecond*10, StatusSignalType, func(sig IDStateSignal) bool {
-    return sig.State == "TEST"
+  _, err = WaitForSignal(ctx, l2_listener, time.Millisecond*10, StatusSignalType, func(sig IDStringSignal) bool {
+    return sig.Str == "TEST"
   })
   fatalErr(t, err)
 }
@@ -91,8 +91,8 @@ func TestLink10K(t *testing.T) {
 
 
   for range(lockables) {
-    _, err := WaitForSignal(ctx, l0_listener, time.Millisecond*10, LinkStartSignalType, func(sig IDStateSignal) bool {
-      return sig.State == "linked_as_req"
+    _, err := WaitForSignal(ctx, l0_listener, time.Millisecond*10, LinkStartSignalType, func(sig IDStringSignal) bool {
+      return sig.Str == "linked_as_req"
     })
     fatalErr(t, err)
   }
@@ -140,15 +140,15 @@ func TestLock(t *testing.T) {
   err = LinkRequirement(ctx, l0.ID, l5.ID)
   fatalErr(t, err)
 
-  linked_as_req := func(sig IDStateSignal) bool {
-    return sig.State == "linked_as_req"
+  linked_as_req := func(sig IDStringSignal) bool {
+    return sig.Str == "linked_as_req"
   }
 
-  locked := func(sig StateSignal) bool {
-    return sig.State == "locked"
+  locked := func(sig StringSignal) bool {
+    return sig.Str == "locked"
   }
 
-  _, err = WaitForSignal(ctx, l1_listener, time.Millisecond*10, LinkStartSignalType, linked_as_req)
+    _, err = WaitForSignal(ctx, l1_listener, time.Millisecond*10, LinkStartSignalType, linked_as_req)
   fatalErr(t, err)
   _, err = WaitForSignal(ctx, l1_listener, time.Millisecond*10, LinkStartSignalType, linked_as_req)
   fatalErr(t, err)
diff --git a/node_test.go b/node_test.go
index bc79432..3b60d32 100644
--- a/node_test.go
+++ b/node_test.go
@@ -91,7 +91,7 @@ func TestECDH(t *testing.T) {
   fatalErr(t, err)
 
   _, err = WaitForSignal(ctx, n1_listener, 100*time.Millisecond, ECDHSignalType, func(sig ECDHSignal) bool {
-    return sig.State == "resp"
+    return sig.Str == "resp"
   })
   fatalErr(t, err)
   time.Sleep(10*time.Millisecond)
diff --git a/signal.go b/signal.go
index b4efc56..0540688 100644
--- a/signal.go
+++ b/signal.go
@@ -17,6 +17,7 @@ import (
 type SignalDirection int
 const (
   StopSignalType SignalType = "STOP"
+  ErrorSignalType           = "ERROR"
   StatusSignalType          = "STATUS"
   LinkSignalType            = "LINK"
   LockSignalType            = "LOCK"
@@ -126,6 +127,18 @@ func NewDirectSignal(signal_type SignalType) BaseSignal {
 
 var StopSignal = NewDownSignal(StopSignalType)
 
+type ErrorSignal struct {
+  BaseSignal
+  Error error `json:"error"`
+}
+
+func NewErrorSignal(err error) ErrorSignal {
+  return ErrorSignal{
+    BaseSignal: NewDirectSignal(ErrorSignalType),
+    Error: err,
+  }
+}
+
 type IDSignal struct {
   BaseSignal
   ID NodeID `json:"id"`
@@ -150,26 +163,26 @@ func NewIDSignal(signal_type SignalType, direction SignalDirection, id NodeID) I
   }
 }
 
-type StateSignal struct {
+type StringSignal struct {
   BaseSignal
-  State string `json:"state"`
+  Str string `json:"state"`
 }
 
-func (signal StateSignal) Serialize() ([]byte, error) {
+func (signal StringSignal) Serialize() ([]byte, error) {
   return json.Marshal(&signal)
 }
 
-type IDStateSignal struct {
+type IDStringSignal struct {
   BaseSignal
   ID NodeID `json:"id"`
-  State string `json:"state"`
+  Str string `json:"state"`
 }
 
-func (signal IDStateSignal) Serialize() ([]byte, error) {
+func (signal IDStringSignal) Serialize() ([]byte, error) {
   return json.Marshal(&signal)
 }
 
-func (signal IDStateSignal) String() string {
+func (signal IDStringSignal) String() string {
   ser, err := json.Marshal(signal)
   if err != nil {
     return "STATE_SER_ERR"
@@ -177,42 +190,42 @@ func (signal IDStateSignal) String() string {
   return string(ser)
 }
 
-func NewStatusSignal(status string, source NodeID) IDStateSignal {
-  return IDStateSignal{
+func NewStatusSignal(status string, source NodeID) IDStringSignal {
+  return IDStringSignal{
     BaseSignal: NewUpSignal(StatusSignalType),
     ID: source,
-    State: status,
+    Str: status,
   }
 }
 
-func NewLinkSignal(state string) StateSignal {
-  return StateSignal{
+func NewLinkSignal(state string) StringSignal {
+  return StringSignal{
     BaseSignal: NewDirectSignal(LinkSignalType),
-    State: state,
+    Str: state,
   }
 }
 
-func NewIDStateSignal(signal_type SignalType, direction SignalDirection, state string, id NodeID) IDStateSignal {
-  return IDStateSignal{
+func NewIDStringSignal(signal_type SignalType, direction SignalDirection, state string, id NodeID) IDStringSignal {
+  return IDStringSignal{
     BaseSignal: NewBaseSignal(signal_type, direction),
     ID: id,
-    State: state,
+    Str: state,
   }
 }
 
-func NewLinkStartSignal(link_type string, target NodeID) IDStateSignal {
-  return NewIDStateSignal(LinkStartSignalType, Direct, link_type, target)
+func NewLinkStartSignal(link_type string, target NodeID) IDStringSignal {
+  return NewIDStringSignal(LinkStartSignalType, Direct, link_type, target)
 }
 
-func NewLockSignal(state string) StateSignal {
-  return StateSignal{
+func NewLockSignal(state string) StringSignal {
+  return StringSignal{
     BaseSignal: NewDirectSignal(LockSignalType),
-    State: state,
+    Str: state,
   }
 }
 
-func (signal StateSignal) Permission() Action {
-  return MakeAction(signal.Type(), signal.State)
+func (signal StringSignal) Permission() Action {
+  return MakeAction(signal.Type(), signal.Str)
 }
 
 type ReadSignal struct {
@@ -250,7 +263,7 @@ func NewReadResultSignal(req_id uuid.UUID, node_type NodeType, exts map[ExtType]
 }
 
 type ECDHSignal struct {
-  StateSignal
+  StringSignal
   Time time.Time
   ECDSA *ecdsa.PublicKey
   ECDH *ecdh.PublicKey
@@ -258,7 +271,7 @@ type ECDHSignal struct {
 }
 
 type ECDHSignalJSON struct {
-  StateSignal
+  StringSignal
   Time time.Time `json:"time"`
   ECDSA []byte `json:"ecdsa_pubkey"`
   ECDH []byte `json:"ecdh_pubkey"`
@@ -267,7 +280,7 @@ type ECDHSignalJSON struct {
 
 func (signal *ECDHSignal) MarshalJSON() ([]byte, error) {
   return json.Marshal(&ECDHSignalJSON{
-    StateSignal: signal.StateSignal,
+    StringSignal: signal.StringSignal,
     Time: signal.Time,
     ECDH: signal.ECDH.Bytes(),
     ECDSA: signal.ECDH.Bytes(),
@@ -310,9 +323,9 @@ func NewECDHReqSignal(ctx *Context, node *Node) (ECDHSignal, *ecdh.PrivateKey, e
   }
 
   return ECDHSignal{
-    StateSignal: StateSignal{
+    StringSignal: StringSignal{
       BaseSignal: NewDirectSignal(ECDHSignalType),
-      State: "req",
+      Str: "req",
     },
     Time: now,
     ECDSA: &node.Key.PublicKey,
@@ -352,9 +365,9 @@ func NewECDHRespSignal(ctx *Context, node *Node, req ECDHSignal) (ECDHSignal, []
   }
 
   return ECDHSignal{
-    StateSignal: StateSignal{
+    StringSignal: StringSignal{
       BaseSignal: NewDirectSignal(ECDHSignalType),
-      State: "resp",
+      Str: "resp",
     },
     Time: now,
     ECDSA: &node.Key.PublicKey,