- Fri Dec 12, 2014 10:23 am
#4676
Being a total newb to this Lua thing, some feedback on my use of tables and substrings would be useful.
This would use less heap without the function definitions, but would be much less easily readable.
Code: Select all
-- choose the strongest open AP available and connect to it
-- tested with NodeMcu 0.9.2 build 20141212
ConnStatus = nil
function ConnStatus(n)
status = wifi.sta.status()
uart.write(0,' '..status)
local x = n+1
if (x < 50) and ( status < 5 ) then
tmr.alarm(0,100,0,function() ConnStatus(x) end)
else
if status == 5 then
print('\nConnected as '..wifi.sta.getip())
else
print("\nConnection failed")
end
end
end
best_ssid = nil
function best_ssid(ap_db)
local min = 100
for k,v in pairs(ap_db) do
if tonumber(v) < min then
min = tonumber(v)
ssid = k
end
end
end
best = nil
function best(aplist)
ssid = nil
print("\nAvailable Open Access Points:\n")
for k,v in pairs(aplist) do print(k..' '..v) end
ap_db = nil
ap_db = {}
if nil ~= next(aplist) then
for k,v in pairs(aplist) do
if '0' == string.sub(v,1,1) then
ap_db[k] = string.match(v, '-(%d+),')
end
end
if nil ~= next(ap_db) then
best_ssid(ap_db)
end
end
if nil ~= ssid then
print("\nBest SSID: ".. ssid)
wifi.sta.config(ssid,"")
print("\nConnecting to "..ssid)
ConnStatus(0)
else
print("\nNo available open APs")
end
end
wifi.setmode(wifi.STATION)
wifi.sta.getap(function(t) best(t) end)
Being a total newb to this Lua thing, some feedback on my use of tables and substrings would be useful.
This would use less heap without the function definitions, but would be much less easily readable.
ESP8266 for dummies, LuaLoader and project updates: http://benlo.com/esp8266
