From 7f1fb35c9b18b723c34b2a9d42e804234bae0c1e Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Sat, 21 May 2022 06:20:12 +0200
Subject: allow reading report mode; add query command

---
 init.lua   | 19 +++++++++++++++++++
 sds011.lua | 21 +++++++++++++++------
 2 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/init.lua b/init.lua
index 6dc32d0..4c38550 100644
--- a/init.lua
+++ b/init.lua
@@ -18,6 +18,9 @@ gpio.write(ledpin, 0)
 
 sds011 = require("sds011")
 
+poll = tmr.create()
+polling = false
+
 function log_restart()
 	print("Network error " .. wifi.sta.status())
 end
@@ -65,6 +68,17 @@ function uart_callback(data)
 		work_period = string.format("%d min", sds011.work_period)
 	end
 
+	if sds011.work_period == 0 and not polling then
+		polling = true
+		port:write(sds011.set_report_mode(false))
+		poll:start()
+	end
+	if sds011.work_period > 0 and polling then
+		polling = false
+		port:write(sds011.set_report_mode(true))
+		poll:stop()
+	end
+
 	local json_str = string.format('{"rssi_dbm":%d,"period":"%s"', wifi.sta.getrssi(), work_period)
 	if sds011.pm2_5i ~= nil then
 		json_str = string.format('%s,"pm2_5_ugm3":%d.%d,"pm10_ugm3":%d.%d', json_str, sds011.pm2_5i, sds011.pm2_5f, sds011.pm10i, sds011.pm10f)
@@ -99,6 +113,10 @@ function publish_influx(payload)
 	end
 end
 
+function query_data()
+	port:write(sds011.query())
+end
+
 function hass_config(client, topic, message)
 	if topic == "config/" .. device_id .. "/set/work_period" then
 		local work_period = 0
@@ -133,6 +151,7 @@ function hass_register()
 end
 
 watchdog:register(20 * 60 * 1000, tmr.ALARM_SEMI, node.restart)
+poll:register(10 * 1000, tmr.ALARM_AUTO, query_data)
 watchdog:start()
 
 connect_wifi()
diff --git a/sds011.lua b/sds011.lua
index 98f5b09..8d5dd58 100644
--- a/sds011.lua
+++ b/sds011.lua
@@ -30,13 +30,22 @@ function sds011.finish_cmd(cmd)
 	return cmd
 end
 
+function sds011.query()
+	local cmd = string.char(c_head, c_id, c_query)
+	cmd = cmd .. string.char(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+	return sds011.finish_cmd(cmd)
+end
+
 function sds011.set_report_mode(active)
-	local cmd = string.char(c_head, c_id, c_report_mode, c_write)
-	if active then
-		cmd = cmd .. string.char(c_active)
-	else
-		cmd = cmd .. string.char(c_passive)
+	local op = c_write
+	local cmd = c_passive
+	if active == nil then
+		op = c_read
+		active = false
+	elseif active then
+		cmd = c_active
 	end
+	local cmd = string.char(c_head, c_id, c_report_mode, op, cmd)
 	cmd = cmd .. string.char(0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
 	return sds011.finish_cmd(cmd)
 end
@@ -82,7 +91,7 @@ function sds011.parse_frame(data)
 		sds011.pm10f = pm10 % 10
 		return true
 	end
-	if command == 0xc5 then
+	if command == 0xc5 and pm25l == 0x08 then
 		sds011.work_period = pm10l
 		return true
 	end
-- 
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