diff --git a/supervisor/session/plc.lua b/supervisor/session/plc.lua
index 91fbacc..3adb85d 100644
--- a/supervisor/session/plc.lua
+++ b/supervisor/session/plc.lua
@@ -348,7 +348,7 @@ function new_session(id, for_reactor, in_queue, out_queue)
 
             local elapsed = os.clock() - self.periodics.last_update
 
-            self.periodics.keep_alive += elapsed
+            self.periodics.keep_alive = self.periodics.keep_alive + elapsed
 
             if self.periodics.keep_alive >= PERIODICS.KEEP_ALIVE then
                 _send(RPLC_TYPES.KEEP_ALIVE, { os.epoch() })
diff --git a/supervisor/session/svsessions.lua b/supervisor/session/svsessions.lua
index 4e0c75e..edc2ea2 100644
--- a/supervisor/session/svsessions.lua
+++ b/supervisor/session/svsessions.lua
@@ -10,7 +10,7 @@ SESSION_TYPE = {
 }
 
 local self = {
-    modem = nil
+    modem = nil,
     num_reactors = 0,
     rtu_sessions = {},
     plc_sessions = {},
diff --git a/supervisor/startup.lua b/supervisor/startup.lua
index 3395b81..fa4de82 100644
--- a/supervisor/startup.lua
+++ b/supervisor/startup.lua
@@ -10,14 +10,15 @@ os.loadAPI("scada-common/modbus.lua")
 
 os.loadAPI("config.lua")
 os.loadAPI("mqueue.lua")
-os.loadAPI("supervisor.lua")
 
 os.loadAPI("session/rtu.lua")
 os.loadAPI("session/plc.lua")
 os.loadAPI("session/coordinator.lua")
 os.loadAPI("session/svsessions.lua")
 
-local SUPERVISOR_VERSION = "alpha-v0.1.3"
+os.loadAPI("supervisor.lua")
+
+local SUPERVISOR_VERSION = "alpha-v0.1.4"
 
 local print = util.print
 local println = util.println
@@ -40,7 +41,7 @@ if modem == nil then
 end
 
 -- start comms, open all channels
-local comms = supervisor.superv_comms(config.NUM_REACTORS, modem, config.SCADA_DEV_LISTEN, config.SCADA_SV_LISTEN)
+local superv_comms = supervisor.superv_comms(config.NUM_REACTORS, modem, config.SCADA_DEV_LISTEN, config.SCADA_SV_LISTEN)
 
 -- base loop clock (4Hz, 5 ticks)
 local loop_clock = os.startTimer(0.25)
diff --git a/supervisor/supervisor.lua b/supervisor/supervisor.lua
index a3d2d2a..25154bb 100644
--- a/supervisor/supervisor.lua
+++ b/supervisor/supervisor.lua
@@ -11,9 +11,8 @@ local RTU_ADVERT_TYPES = comms.RTU_ADVERT_TYPES
 local SESSION_TYPE = svsessions.SESSION_TYPE
 
 -- supervisory controller communications
-function superv_comms(mode, num_reactors, modem, dev_listen, coord_listen)
+function superv_comms(num_reactors, modem, dev_listen, coord_listen)
     local self = {
-        mode = mode,
         ln_seq_num = 0,
         num_reactors = num_reactors,
         modem = modem,