#147 possible fix for MODBUS failures on server startup

rtu/dev/envd_rtu.lua

@@ -5,9 +5,13 @@ local envd_rtu = {}
 -- create new environment detector device
 ---@nodiscard
 ---@param envd table
+---@return rtu_device interface, boolean faulted
 function envd_rtu.new(envd)
     local unit = rtu.init_unit()
 
+    -- disable auto fault clearing
+    envd.__p_disable_afc()
+
     -- discrete inputs --
     -- none
 
@@ -21,7 +25,12 @@ function envd_rtu.new(envd)
     -- holding registers --
     -- none
 
-    return unit.interface()
+    -- check if any calls faulted
+    local faulted = envd.__p_is_faulted()
+    envd.__p_clear_fault()
+    envd.__p_enable_afc()
+
+    return unit.interface(), faulted
 end
 
 return envd_rtu