From a1e55358b5b26a399c982a27a64a0566173d22d0 Mon Sep 17 00:00:00 2001
From: Antoine Van Elstraete <antoine@van-elstraete.net>
Date: Wed, 13 Jul 2022 22:16:15 +0200
Subject: [PATCH] =?UTF-8?q?Renvoie=20les=20temp=C3=A9ratures=20des=20DS18B?=
 =?UTF-8?q?20?=
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---
 server.lua | 75 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 68 insertions(+), 7 deletions(-)

diff --git a/server.lua b/server.lua
index b6d4290..b72854b 100644
--- a/server.lua
+++ b/server.lua
@@ -1,9 +1,70 @@
-cs=coap.Server()
-cs:listen(5683)
+-- vim : set autoindent expandtab tabstop=2 shiftwidth=2
 
-function hello(payload)
-  print("hello called")
-  respond = "hello"
-  return respond
+cs=coap.Server() -- Lance le serveur CoAP
+cs:listen(5683)  -- sur le port 5683
+
+pin = 3
+ow.setup(pin) -- DS18B20 sur le pin 3
+
+
+function get_data(nbre)
+  capteurs = {}
+  temperatures = {}
+  print("Cherche les capteurs : ")
+  print(nbre)
+  addr = ow.reset_search(pin)
+  for ds = 1, nbre, 1 do
+    addr = ow.search(pin)
+    if addr == nil then
+      pint("Pas de capteurs")
+    else
+      print(addr:byte(1,8))
+      local crc = ow.crc8(string.sub(addr,1,7))
+      if crc == addr:byte(8) then
+        if (addr:byte(1) == 0x10) or (addr:byte(1) == 0x28) then
+          print("Device is a DS18S20 family device.")
+          table.insert(capteurs, addr)
+        end
+      end
+    end
+  end
+  ow.reset(pin)
+  for _, addr in ipairs(capteurs) do
+    tmr.create():alarm(1500, tmr.ALARM_SINGLE, startup)
+    ow.reset(pin)
+    ow.select(pin, addr)
+    ow.write(pin, 0x44, 1)
+    tmr.create():alarm(1500, tmr.ALARM_SINGLE, startup)
+    ow.reset(pin)
+    ow.select(pin, addr)
+    ow.write(pin,0xBE,1)
+    local data = ow.read_bytes(pin, 9)
+    local crc = ow.crc8(string.sub(data,1,8))
+    if crc == data:byte(9) then
+      local t = (data:byte(1) + data:byte(2) * 256) * 625
+      local sgn = t<0 and -1 or 1
+      local tA = sgn*t
+      local t1 = math.floor(tA / 10000)
+      local t2 = tA % 10000
+      temperature = (sgn<0 and "-" or "")..t1.."."..t2
+      print("temperature ="..temperature.." C")
+      local addr1 = addr:byte(1)
+      local addr2 = addr:byte(2)
+      local addr3 = addr:byte(3)
+      local addr4 = addr:byte(4)
+      local addr5 = addr:byte(5)
+      local addr6 = addr:byte(6)
+      local addr7 = addr:byte(7)
+      local addr8 = addr:byte(8)
+      local addr0 = string.format("%s:%s:%s:%s:%s:%s:%s:%s", addr1, addr2, addr3, addr4, addr5, addr6, addr7, addr8)
+      result = addr0.."="..temperature
+      table.insert(temperatures, result)
+    end
+  end
+  data = table.concat(temperatures,";")
+  print("data :")
+  print(data)
+  return data
 end
-cs:func("hello")
+
+cs:func("get_data")