When asking for the wifi RSSI. the Node32s board being at 30 meters from the router, I get a result of -79.
Is that stronger than -45?
Is it the wifi reading from (by) the card?
RSSI, or “Received Signal Strength Indicator”, is a measurement of how well your device can hear a signal from an access point or router.
WiFi signal strength is represented either as quality in percentage, or an RSSI value in dBm. RSSI is usually expressed in decibels relative to a milliwat (dBm) from zero to -120 dBm. The closer it is to zero, the stronger the signal is.
RSSI level less than -80 dBm may not be usable, depending on noise. In general, the following correlation can be applied:
- RSSI ≥ -50 dBm => quality = 100%
- RSSI ≤ -100 dBm => quality = 0%
- -100 dBm ≤ RSSI ≤ -50 dBm => quality ~= 2 x (RSSI + 100)
- RSSI = -79 dBm => quality ~= 42%
- RSSI = -45 dBm => quality = 100%