Problems in trying to create a hotspot in RPI3

Question

I am relatively new to Raspberry Pi programming, and have been using a RPi3 to try and create a hotspot in order to send data from an Android device using MQTT.

I use hostapd and dnsmasq in order to create the hotspot and have tried using two different methods for the IP address.

Using a static IP address, I am able to create the hotspot and connect to it. However, the MQTT connection fails, and I am not able to send data from the Android.

Using a manual IP address, I am able to create a hotspot but not connect it. Trying to connect to it shows the device trying to obtain the IP address indefinitely. Additionally, hovering over the Wi-Fi symbol on the Raspbian Desktop shows the message:

Connection to dhcpcd lost.

I tried following all the basic tutorials and guides, involving hostapd and dnsmasq, modified the dnsmasq.conf file, network/interfaces file and such. However, the same problem seems to arise, being:

Connection to dhcpcd lost.

This is what I have done so far,

Modified the hostapd.conf file as follows

interface=wlan0
driver=nl80211
ssid=RPIHotspot
hw_mode=g
channel=7
wmm_enabled=0
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=123456789
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

The dnsmasq.conf as follows

interface=wlan0
dhcp-range=192.168.4.2,192.168.4.20,255.255.255.0,24h

and changed the network/interfaces as

auto lo wlan0
iface lo inet loopback
allow-hotplug wlan0
iface wlan0 inet manual
# wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

The dhcpcd.conf file

interface wlan0
static ip_address=192.168.1.42
static routers=192.168.1.1
static domain_name_servers=8.8.8.8
interface=wlan0
domain-needed
bogus-priv
dhcp-range=192.168.1.8,192.168.1.250,12h`

After doing so, I restarted the hostapd, and dnsmasq files. And after rebooting the system, dhcpcd was lost

Any help in solving this issue would be greatly appreciated.