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March 25, 2019 12:52
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This example shows how device code can deliberately disconnect from the server yet remain operational.
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// EARLY CALL CODE | |
server.setsendtimeoutpolicy(RETURN_ON_ERROR, WAIT_TIL_SENT, 30.0); | |
// GLOBALS | |
local downTime = time(); | |
local reconnectAttemptFlag = false; | |
local sensorData = {}; | |
// FUNCTIONS | |
function mainLoop() { | |
// Schedule the next sample in 2 seconds | |
imp.wakeup(2.0, mainLoop); | |
// Sample data from sensor(s), process it and store it in 'sensorData' | |
// NOTE Body of function omitted for clarity | |
// Check whether it's time to attempt to reconnect | |
if (time() - downTime > 3600 && !reconnectAttemptFlag) { | |
// Every hour, attempt to connect to WiFi | |
reconnectAttemptFlag = true; | |
// Attempt to connect to server. Use default timeout, 30s | |
server.connect(disconnectHandler); | |
} | |
} | |
function disconnectHandler(reason) { | |
reconnectAttemptFlag = false; | |
downTime = time(); | |
if (reason == SERVER_CONNECTED) { | |
// Device has successfully connected | |
server.log("Device temporarily online to save data"); | |
// Relay data to agent | |
agent.send("save.data", sensorData); | |
sensorData = {}; | |
// Warn about going offline, then disconnect | |
server.log("Device is now going offline"); | |
imp.onidle(function() { | |
server.flush(10); | |
server.disconnect(); | |
}); | |
} | |
} | |
// START OF RUNTIME | |
server.log("Device is running, but going offline"); | |
// Queue up the disconnection to take place once Squirrel | |
// is done (ie. after line 59 has been executed) and | |
// impOS is ready | |
imp.onidle(function() { | |
server.flush(10); | |
server.disconnect(); | |
downTime = time(); | |
}); | |
// Start the loop in two seconds' time | |
imp.wakeup(2.0, mainLoop); |
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