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| Specification | BLE | ESP-NOW |
|---|---|---|
| Protocol | Standard | Proprietary |
| Communication methodology | Master/Slave | Sender/Receiver |
| Communication mode | Unidirectional | Bidirectional |
| Maximum connected slave nodes | 3 | 7 “up to our experiments” |
| Maximum distance between nodes |
6 meter | 15.5 meter “indoor” 90 meter “outdoor” according to our experiments |
| Power consumption | Very low | Low |
