From c95ebb63b4c42a09ab7e6357f6799fbea662054d Mon Sep 17 00:00:00 2001
From: Gunar Schorcht <gunar@schorcht.net>
Date: Tue, 31 Mar 2020 07:29:01 +0200
Subject: [PATCH] sys/net: add NETOPT_RSSI for wireless channels

---
 sys/include/net/netopt.h           | 11 +++++++++++
 sys/net/crosslayer/netopt/netopt.c |  1 +
 sys/shell/commands/sc_gnrc_netif.c |  5 +++++
 3 files changed, 17 insertions(+)

diff --git a/sys/include/net/netopt.h b/sys/include/net/netopt.h
index 0962f1d194..b3644029d3 100644
--- a/sys/include/net/netopt.h
+++ b/sys/include/net/netopt.h
@@ -729,6 +729,17 @@ typedef enum {
      */
     NETOPT_LINK_CHECK,
 
+    /**
+     * @brief (int8_t) Received Signal Strength Indicator (RSSI)
+     *
+     * The RSSI is an indicator for the received field strength in wireless
+     * channels. It is often represented as the ratio of received power to
+     * a given unit, for example milliwatts. With a device-dependent scaling
+     * factor, the RSSI value can be expressed as power level in the unit
+     * dBm or ASU (Arbitrary Strength Unit).
+     */
+    NETOPT_RSSI,
+
     /**
      * @brief   maximum number of options defined here.
      *
diff --git a/sys/net/crosslayer/netopt/netopt.c b/sys/net/crosslayer/netopt/netopt.c
index 99b9eed605..d2ef4e9a9c 100644
--- a/sys/net/crosslayer/netopt/netopt.c
+++ b/sys/net/crosslayer/netopt/netopt.c
@@ -120,6 +120,7 @@ static const char *_netopt_strmap[] = {
     [NETOPT_DEMOD_MARGIN]          = "NETOPT_DEMOD_MARGIN",
     [NETOPT_NUM_GATEWAYS]          = "NETOPT_NUM_GATEWAYS",
     [NETOPT_LINK_CHECK]            = "NETOPT_LINK_CHECK",
+    [NETOPT_RSSI]                  = "NETOPT_RSSI",
     [NETOPT_NUMOF]                 = "NETOPT_NUMOF",
 };
 
diff --git a/sys/shell/commands/sc_gnrc_netif.c b/sys/shell/commands/sc_gnrc_netif.c
index 32e14025f9..01be524b98 100644
--- a/sys/shell/commands/sc_gnrc_netif.c
+++ b/sys/shell/commands/sc_gnrc_netif.c
@@ -531,6 +531,7 @@ static void _netif_list(netif_t *iface)
     uint16_t u16;
     int16_t i16;
     uint8_t u8;
+    int8_t i8;
     int res;
     netopt_state_t state;
     unsigned line_thresh = 1;
@@ -561,6 +562,10 @@ static void _netif_list(netif_t *iface)
     if (res >= 0) {
         printf(" NID: 0x%" PRIx16 " ", u16);
     }
+    res = netif_get_opt(iface, NETOPT_RSSI, 0, &i8, sizeof(i8));
+    if (res >= 0) {
+        printf(" RSSI: %d ", i8);
+    }
 #ifdef MODULE_GNRC_NETIF_CMD_LORA
     res = netif_get_opt(iface, NETOPT_BANDWIDTH, 0, &u8, sizeof(u8));
     if (res >= 0) {