can_transmit_to_channel() ignores freq value just focus on channel number

Author: garywill

lnxrouter

@@ -630,11 +630,7 @@ can_transmit_to_channel() {
     CHANNEL_NUM=$2
 
     if [[ $USE_IWCONFIG -eq 0 ]]; then
-        if [[ $FREQ_BAND == 2.4 ]]; then
-            CHANNEL_INFO=$(get_adapter_info "${IFACE}" | grep -E " 24[0-9][0-9](\.0+){0,1} MHz \[${CHANNEL_NUM}\]")
-        else
-            CHANNEL_INFO=$(get_adapter_info "${IFACE}" | grep " \(49[0-9][0-9]\|5[0-9]\{3\}\) MHz \[${CHANNEL_NUM}\]")
-        fi
+        CHANNEL_INFO=$(get_adapter_info "${IFACE}" | grep -E " [0-9]+(\.[0-9]+){0,1} MHz \[${CHANNEL_NUM}\]")
         [[ -z "${CHANNEL_INFO}" ]] && return 1
         [[ "${CHANNEL_INFO}" == *no\ IR* ]] && return 1
         [[ "${CHANNEL_INFO}" == *disabled* ]] && return 1
@@ -665,9 +661,6 @@ ieee80211_frequency_to_channel() {
     fi
 }
 
-is_5ghz_frequency() {
-    [[ $1 =~ ^(49[0-9]{2})|(5[0-9]{3})$ ]]
-}
 
 is_interface_wifi_connected() {
     if [[ $USE_IWCONFIG -eq 0 ]]; then
@@ -1700,7 +1693,7 @@ prepare_wifi_interface() {
 
         # TODO move this to check_wifi_settings() ?
         if is_interface_wifi_connected "${WIFI_IFACE}"; then
-            WIFI_IFACE_FREQ=$(iw dev "${WIFI_IFACE}" link | grep -i freq | awk '{print $2}' | sed 's/\.00*$//g')
+            WIFI_IFACE_FREQ=$(iw dev "${WIFI_IFACE}" link | grep -i freq | awk '{print $2}' | sed 's/\.00*$//g')  # NOTE we assume integer currently, which can be right, or wrong  in the future
             WIFI_IFACE_CHANNEL=$(ieee80211_frequency_to_channel "${WIFI_IFACE_FREQ}")
 
             echo "${WIFI_IFACE} already working in channel ${WIFI_IFACE_CHANNEL} (${WIFI_IFACE_FREQ} MHz)"