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On the wialon platform, sensors tab, there are some sensors called io, what does it mean and what are they for? sent in print
IO in Wialon is equivalent to AVL ID of teltonika device.
if you are using FMM130 here is the AVL ID link: FMM130 Teltonika Data Sending Parameters ID - Wiki Knowledge Base | Teltonika GPS (teltonika-gps.com)
For example, io_237 = AVLID 237 which is the Network Type.
IO is available from the raw data that you received, IO can be added as a sensor in Wialon if you added a customized sensor, for example, you can modify how you want to monitor that particular IO or parameter.
Check the photo below.