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10	10	* The reason MongoDB 2.4 is installed under Raspian, seems to be because later versions of MongoDB are 64 bit and Raspian is 32 bit.  You would need to install a 64 bit version of Linux, such as [[Ubuntu>>https://pimylifeup.com/ubuntu-server-raspberry-pi/]], onto your Raspberry Pi and then you can follow the instructions above.
11	11	** You can't install a 64 bit Ubuntu onto a Raspberry PI Zero or Zero W, because it requires ARMv7 processor and the Zero series is based on ARMv6.
12	12	*** Probably the smallest choice would be Raspberry Pi Model 3 A+.
	13	+
	14	+I finally ended up using a Raspberry Pi model 3 A+.  This is an ARMv7 processor, so it can do 64 bit Linux, it has built-in Wifi, and it's still small and cheap.  The system doesn't have a lot of memory, so I purchased a 32Gb micro-SD card and [[created a 16Gb swapfile>>https://linuxize.com/post/how-to-add-swap-space-on-ubuntu-18-04/]].  I installed Ubuntu 19 from here:
	15	+
	16	+[[http:~~/~~/cdimage.ubuntu.com/releases/eoan/release/ubuntu-19.10.1-preinstalled-server-arm64+raspi3.img.xz>>http://cdimage.ubuntu.com/releases/eoan/release/ubuntu-19.10.1-preinstalled-server-arm64+raspi3.img.xz]]
	17	+
	18	+
	19	+You'll want to configure the Wifi using "netplan" (/etc/netplan directory):
	20	+
	21	+(% class="box" %)
	22	+(((
	23	+network:
	24	+ ethernets:
	25	+ eth0:
	26	+ dhcp4: true
	27	+ optional: true
	28	+ version: 2
	29	+ wifis:
	30	+ wlan0:
	31	+ dhcp4: true
	32	+ access-points:
	33	+ "My Network Name":
	34	+ password: "My Network Password"
	35	+)))
	36	+
	37	+Then install the packages mentioned on the above web page as root, but install the "Nightscout" installation ("npm install") as a non-root user.
	38	+
	39	+Finally, here's a sample "start.sh" file:
	40	+
	41	+
	42	+(% class="box" %)
	43	+(((
	44	+#!/usr/bin/bash
	45	+
	46	+export SSL_KEY=MyCertKeyFile.key
	47	+export SSL_CERT=MyCertFullchainFile.cer
	48	+export SSL_CA=MyCertFullchainFile.cer
	49	+
	50	+# environment variables
	51	+export DISPLAY_UNITS="mg/dl"
	52	+#export MONGO_CONNECTION="mongodb:~/~/MyNightscoutUsername:MyNightscoutPassword@localhost:27017/Nightscout"
	53	+export MONGO_CONNECTION="mongodb:~/~/localhost:27017/Nightscout"
	54	+export BASE_URL="https:~/~/nightscout.example.com"
	55	+export PORT=443
	56	+export API_SECRET="My Nightscout Secret"
	57	+
	58	+export PUMP_FIELDS="reservoir battery status"
	59	+export DEVICESTATUS_ADVANCED=true
	60	+export ENABLE="careportal iob cob openaps pump bwg rawbg basal bridge"
	61	+export BRIDGE_PASSWORD="My Dexcom Share password"
	62	+export BRIDGE_USER_NAME="My Dexcom Share Username"
	63	+
	64	+export TIME_FORMAT=24
	65	+
	66	+# start server
	67	+node ~-~-no-deprecation server.js
	68	+
	69	+)))