Enabling WiFi roaming on Raspberry Pi

wpa_roam:-
Gives priority to wireless networks.

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/etc/wpa_supplicant/wpa_supplicant.conf:
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
#update_config=1
country=GB

network={
    ssid="ssid1"
    psk="wpa1"
    key_mgmt=WPA-PSK
    priority=1
    id_str="NetBackup"
}


network={
    ssid="ssid2"
    psk="wpa2"
    key_mgmt=WPA-PSK
    #priority given to greatest (numerical value) first
    priority=2
    id_str="NetPrefer"
}


/etc/network/interfaces:
# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.0.1
network 192.168.0.0
broadcast 192.168.0.255
netmask 255.255.255.0

iface wlan0 inet manual
    wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface NetPrefer inet dhcp
iface NetBackup inet dhcp