If the cloud connection is turned on and trying to connect to the cloud unsuccessfully, Particle.publish() may block for up to 20 seconds (normal conditions) to 10 minutes (unusual conditions). Checking Particle.connected() can before calling Particle.publish() can help prevent this.
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When your device connects to the Particle cloud, if often can do so by resuming the previous session. This dramatically reduces the amount of data used, from around 5-6 Kbytes of data for a full handshake to hundreds of bytes of data for a resume. While a full session handshake does not use data operations, if done excessively it can impact the total data usage on cellular devices. Sessions are automatically renegotiated every 3 days for security reasons.
Note that Cellular.on() does not need to be called unless you have changed the system mode or you have previously turned the Cellular module off. When turning on the Cellular module, it will go through a full re-connect to the Cellular network which will take anywhere from 30 to 60 seconds in most situations.
Cellular.off() turns off the Cellular module. Useful for saving power, since most of the power draw of the device is the Cellular module. Note: turning off the Cellular module will force it to go through a full re-connect to the Cellular network the next time it is turned on.
This function will return true once the device is attempting to connect using the default Particle APN or 3rd party APN cellular credentials, and will return false once the device has successfully connected to the cellular network.
Note that in most cases, "fully charged" state (red charging LED goes off) will result in a SoC of 80%, not 100%. Using getNormalizedSoC() normalizes the value based on the charge voltage so the SoC will be 100% when the charge LED goes off.
The serialEvent functions are called in between calls to the application loop(). This means that if loop() runs for a long time due to delay() calls or other blocking calls the serial buffer might become full between subsequent calls to serialEvent and serial characters might be lost. Avoid long delay() calls in your application if using serialEvent.
Writes a value to the servo, controlling the shaft accordingly. On a standard servo, this will set the angle of the shaft (in degrees), moving the shaft to that orientation. On a continuous rotation servo, this will set the speed of the servo (with 0 being full-speed in one direction, 180 being full speed in the other, and a value near 90 being no movement).
Writes a value in microseconds (uS) to the servo, controlling the shaft accordingly. On a standard servo, this will set the angle of the shaft. On standard servos a parameter value of 1000 is fully counter-clockwise, 2000 is fully clockwise, and 1500 is in the middle.
The following is a recommended watchdog callback implementation. It sets a reset reason, and does not wait for the cloud connection to gracefully close, since the device is in a bad state and that will likely never complete.
The pseudorandom numbers produced by the firmware are derived from a single value - the random seed.The value of this seed fully determines the sequence of random numbers produced by successivecalls to random(). Using the same seed on two separate runs will producethe same sequence of random numbers, and in contrast, using different seedswill produce a different sequence of random numbers.
Each write containing changed values will add more data to the page until it is full, causing a page erase. When writing unchanged data, there is no flash wear, but there is a penalty in CPU cycles. Try not write to EEPROM every loop() iteration to avoid unnecessary CPU cycle penalties.
hasPendingErase() lets the application developer check if a full EEPROM page needs to be erased.When the application determines it is safe to pause processor execution to erase EEPROM it callsperformPendingErase(). You can call this at boot, or when your device is idle if you expect it torun without rebooting for a long time.
If the application never calls performPendingErase() then the pending page erase will be performedwhen data is written using put() or write() and both pages are full. So callingperformPendingErase() is optional and provided to avoid the uncertainty of a potential processorpause any time put() or write() is called.
Resets the device and restarts in safe mode (blinking green, blinking cyan, followed by breathing magenta). Note that the device must be able to connect to the cloud in order to successfully enter safe mode. 2ff7e9595c
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