diff --git a/apps/iot/src/iot_host.erl b/apps/iot/src/iot_host.erl
index 2e85e77..4cc274d 100644
--- a/apps/iot/src/iot_host.erl
+++ b/apps/iot/src/iot_host.erl
@@ -121,8 +121,9 @@ publish_directive(Pid, DeviceUUID, DirectiveType, Version, DirectiveParams, Time
         <<"directive_type">> => DirectiveType,
         <<"directive">> => DirectiveParams
     },
+    JsonDirective = iolist_to_binary(jiffy:encode(Directive, [force_utf8])),
 
-    case gen_statem:call(Pid, {publish_directive, self(), Directive}) of
+    case gen_statem:call(Pid, {publish_directive, self(), JsonDirective}) of
         {ok, Ref} ->
             receive
                 {ws_response, Ref} ->
@@ -147,7 +148,9 @@ send_directive(Pid, DeviceUUID, DirectiveType, Version, DirectiveParams)
         <<"directive_type">> => DirectiveType,
         <<"directive">> => DirectiveParams
     },
-    gen_statem:call(Pid, {send_directive, Directive}).
+    JsonDirective = iolist_to_binary(jiffy:encode(Directive, [force_utf8])),
+
+    gen_statem:call(Pid, {send_directive, JsonDirective}).
 
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