Recently I was asked to integrate ELS61-E with Intel EDISON with the Arduino kit board. Because the Arduino kit has an USB Host port, so I decided to plug-in Starter Kit B80 with ELS61-E EVK to Intel EDISON, via that USB Host port and tweak the embedded Linux residing inside the EDISON module. Here is a record of how I tweaked it, the steps are easy for average Linux user.
 
1. I downloaded and uses iot-devkit-yp-poky-edison-20160606.zip as starting point, this is the current FW for EDISON board; flash it to the EDISON board.
2. The Linux kernel on EDISON board already included Linux CDC-ACM driver inside, so I make use of it, and configure the Arduino kit for EDISON board to provide USB Host interface for ELS61-E EVK.
3. I enabled Wi-Fi on EDISON board and added 3 new package repositories to the EDISON opkg manager

• http://repo.opkg.net/edison/repo/all/Packages.gz
• http://repo.opkg.net/edison/repo/edison/Packages.gz
• http://repo.opkg.net/edison/repo/core2-32/Packages.gz

4. I install these packages on EDISON board to setup PPP dial-up capability

• ppp
• kernel-module-ppp-generic
• kernel-module-ppp-async
• kernel-module-slhc

5. Setup ppp dial-up script on EDISON board

• edit /etc/ppp/peers/cht-gprs

/dev/ttyACM0
921600
usepeerdns
crtscts
lock
noauth
local
persist
modem
nopcomp
novjccomp
#bsdcomp
nobsdcomp
nodeflate
noaccomp
ipcp-accept-local
ipcp-accept-remote
noipdefault
defaultroute
noipdefault
user ""
password ""
connect "/usr/sbin/chat -v -t15 -f /etc/ppp/cht-gprs.chat"

• edit /etc/ppp/cht-gprs.cht

ABORT BUSY
ABORT 'NO CARRIER'
ABORT VOICE
ABORT 'NO DIALTONE'
ABORT 'NO DIAL TONE'
ABORT 'NO ANSWER'
ABORT DELAYED
 
REPORT CONNECT
 
# modeminit
'' ATZ
OK 'AT+CGDCONT=1,"IP","internet"'
 
# ispnumber
OK-AT-OK "ATD*99***1#"
# ispconnect
CONNECT \d\c

6. edit /etc/resolv.conf on EDISON board
nameserver 8.8.8.8
7. run `killall pppd ; pppd call cht-gprs` on EDISON board
8. using `journalctl -xf -n1000 | grep -e "\(pppd\|chat\)"` on EDISON board to monitor dial-up status, if success, press CTRL-C
 
At this point, the cellular network on EDISON board is up and running.