We are investigating upgrading the firmware on various SierraWireless modules, the HL8548, HL7800 and the HL7688. We would like to use FOTA to do so.
The AT command reference of the HL8548 module mentions the following (see pp 644):
Note: Avoid powering the module down during an AVMS FOTA update (or during a local update using +WDSD), especially between +WDSI:14 and the module’s reboot.
For the HL6528x, the maximum time for a local download (between +WDSD and +WDSI:3) is 3 minutes; and the maxiumum flashing time (upgrade duration between +WDSI:14 and +WDSI:16) is 8 minutes.
I could not find the similar for the HL7800 and the HL7688. Do these modules use a more robust firmware upgrade method that can be interrupted? We do not have control of the power of our devices and are at the whim of the end-user to not power down the device during an upgrade. I’d like to understand when this will be an issue.