From d334b11100d056312d6b1c16076650024605eb93 Mon Sep 17 00:00:00 2001 From: Szymon Janc Date: Wed, 29 Jan 2014 00:47:14 +0100 Subject: [PATCH] android/bluetooth: Add threshold to RSSI change There is no need to report very small RSSI changes. --- android/bluetooth.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/android/bluetooth.c b/android/bluetooth.c index d74d7927f..5aed4aff2 100644 --- a/android/bluetooth.c +++ b/android/bluetooth.c @@ -1045,6 +1045,12 @@ static uint8_t bdaddr_type2android(uint8_t type) return HAL_TYPE_LE; } +static bool rssi_above_threshold(int old, int new) +{ + /* only 8 dBm or more */ + return abs(old - new) >= 8; +} + static void update_found_device(const bdaddr_t *bdaddr, uint8_t bdaddr_type, int8_t rssi, bool confirm, const uint8_t *data, uint8_t data_len) @@ -1113,7 +1119,7 @@ static void update_found_device(const bdaddr_t *bdaddr, uint8_t bdaddr_type, (*num_prop)++; } - if (rssi) { + if (rssi && rssi_above_threshold(dev->rssi, rssi)) { dev->rssi = rssi; size += fill_hal_prop(buf + size, HAL_PROP_DEVICE_RSSI, -- 2.47.3