• PC Engines APU1 system board.
• PC Engines APU1c schematics.
• Huawei MU609 miniPCIe Hardware guide.
• Huawei MU609 miniPCIe AT command spec.
• Huawei MU609 miniPCIe Application guide.

• PC Engines APU: Varia Store
• Huawei MU609 miniPCIe: WM Ocean

• Upgrade BIOS with PXE or USB.
• Install mSATA SSD.
• Install Huawei MU609 miniPCIe. NOTE: Use mPCIe 2 slot, SIM wil not be recognized in slot 1.
• Install U.FL to SMA pigtail.
• Install GSM antenna.

Note: i've had a problem with the stock 2.6 kernel and installed 3.14 kernel-ml from elrepo.

• Connect via serial with screen (or minicom).

  screen /dev/cu.usbserial-A7022UE0 115200

• Install CentOS 6.5 x86_64, using PXE and Kickstart.
• Configure networking.
• Load EPEL repository.
• Load ELRepo repository.
• Configure hostname, mail relayhost and install k10temp module and lm_sensors: CentOS 6.5 on APU - post install.
• Configure NTPd.

  yum install ntp
  
  # vi /etc/ntp.conf
  # update servers
  
  chkconfig ntpd on
  ntpdate ntp1.polaire.nl
  service ntpd start

• Install minicom.

  yum install minicom

• Check to see if device is recognized.

  # dmesg |grep -i huawei
  usb 1-2: Product: HUAWEI Mobile
  usb 1-2: Manufacturer: Huawei Technologies
  
  dmesg |grep CDC
  cdc_ether 2-1:2.0 eth3: register 'cdc_ether' at usb-0000:00:13.2-1, CDC Ethernet Device, 00:a0:c6:41:37:70

• Determine USB tty's.

  # ls /dev |grep -i ttyusb
  ttyUSB0
  ttyUSB1 
  ttyUSB2
  ttyUSB3
  ttyUSB4

  • ttyUSB0: MODEM port: simulated using USB, for AT command interaction and establishing data connection.
  • ttyUSB1: DIAG port: simulated using USB, for DIAG (diagnostic) command interaction (mainly used to debug modules at present).
  • ttyUSB2: PCUI port: simulated using USB, for AT command interaction only.
  • ttyUSB3: GPS NMEA port: simulated using USB, sending unsolicited indications for NMEA positioning data only.
  • ttyUSB4: GPS Control port: simulated using USB, for GPS AT command interaction only.
  • eth3: ECM port: for establishing communication connection.
• Connect to the gsm module.

  minicom -s

• Go to 'Serial port setup' →
  • Serial Device: /dev/ttyUSB2
  • Bps/Par/Bits: 115200 8N1
• Go back and then to 'Modem and dialing parameter setup'
  • Clear init string and reset string.
• Select 'Save setup as dfl'.
• Select 'Exit'.
• Check SIM.

  AT+CREG?
  +CME ERROR: SIM PIN required

• If you see +CME ERROR: SIM failure check if the SIM card is inserted and the module is in mPCIe 2 slot.
• enter SIM PIN.

  AT+CPIN="1234"
  OK
  
  ^SIMST: 1
  
  ^SRVST: 2
  
  AT+CPIN?
  +CPIN: READY
  
  OK

• Check status operator selection. In this case; 0=automatic, 0=long alfanumeric, string, 2=current.

  AT+COPS?
  +COPS: 0,0,"simyo",2
  
  OK

• Check network status. 0=report off, 1=registered

  AT+CREG?
  +CREG: 0,1
  
  OK

• Query signal strength. Good signal strength here: -79 dBm (17 * 2 – 113).

  AT+CSQ
  +CSQ: 17,99
  
  OK

• Install smstools package.

  yum install smstools

• Auto-start smsd.

  chkconfig smsd on

• Edit /etc/smsd.conf.

  [GSM1]
  device = /dev/ttyUSB2
  incoming = yes
  pin = 1234
  # disable unsolicited results (like ^RSSI)
  init = AT^CURC=0

• View log /var/log/smsd/.

  2014-05-30 10:27:23,2, smsd: Smsd v3.1.15 started.
  2014-05-30 10:27:23,2, smsd: Running as smstools:smstools.
  2014-05-30 10:27:23,7, smsd: Running startup_check (shell): /var/spool/sms/incoming/smsd_script.a7tj8n /tmp/smsd_data.4OfwfP
  2014-05-30 10:27:23,7, smsd: Done: startup_check (shell), execution time 0 sec., status: 0 (0)
  2014-05-30 10:27:23,4, smsd: File mode creation mask: 022 (0644, rw-r--r--).
  2014-05-30 10:27:23,5, smsd: Outgoing file checker has started. PID: 1273.
  2014-05-30 10:27:23,7, smsd: All PID's: 1273,1274
  2014-05-30 10:27:23,5, GSM1: Modem handler 0 has started. PID: 1274.
  2014-05-30 10:27:23,5, GSM1: Using check_memory_method 1: CPMS is used.
  2014-05-30 10:27:23,6, GSM1: Checking device for incoming SMS
  2014-05-30 10:27:23,6, GSM1: Checking if modem is ready
  2014-05-30 10:27:23,7, GSM1: -> AT
  2014-05-30 10:27:23,7, GSM1: Command is sent, waiting for the answer
  2014-05-30 10:27:23,7, GSM1: <- AT OK
  2014-05-30 10:27:23,6, GSM1: Pre-initializing modem
  2014-05-30 10:27:24,7, GSM1: -> ATE0+CMEE=1;+CREG=2
  2014-05-30 10:27:24,7, GSM1: Command is sent, waiting for the answer
  2014-05-30 10:27:24,7, GSM1: <- ATE0+CMEE=1;+CREG=2 OK
  2014-05-30 10:27:24,6, GSM1: Checking if modem needs PIN
  2014-05-30 10:27:24,7, GSM1: -> AT+CPIN?
  2014-05-30 10:27:24,7, GSM1: Command is sent, waiting for the answer
  2014-05-30 10:27:24,7, GSM1: <- +CPIN: READY OK
  2014-05-30 10:27:25,7, GSM1: -> AT+CSQ
  ...

• Send test SMS
  • switch so smstools user.

    su - smstools

  • Create a script:

    #!/bin/bash
    OUT=$(mktemp /var/spool/sms/outgoing/sms.XXXXXXXXXX) || { echo "Failed to create temp file"; exit 1; }
    echo -n "To: 31612345678\n\nHello, this is the sms."  >> $OUT

  • chmod +x yourscript, and run it… The smsd.log will show:

    2014-05-30 10:44:55,6, GSM1: I have to send 1 short message for /var/spool/sms/checked/sms.XNBpdjgPIL
    2014-05-30 10:44:55,6, GSM1: Sending SMS from  to 31612345678
    2014-05-30 10:44:55,6, GSM1: Checking if modem is ready
    ...

  • 
• Reduce logging, edit /etc/smsd.conf and reload.

  loglevel = 5
  
  service smsd restart

• Received SMS's wil be placed in /var/spool/sms/incoming.

If you want the APU speaker to beep, see: PC Engines APU - speaker CentOS 6.5 And if you want other users than root to use beep, set the setuid bit.

chmod 4755 /usr/bin/beep

• Create /usr/local/bin/smsevent

  #!/bin/sh
  
  if [ "$1" == "RECEIVED" ]; then
    beep -f700 -l100 -d100 -r3 -n -f1 -l300 -n -f700 -l300 -r2 -n -f1 -l300 -n -f700 -l100 -d100 -r3
  fi

• chmod +x /usr/local/bin/smsevent

• Edit /etc/smsd.conf.

  eventhandler = /usr/local/bin/smsevent

• Restart smsd.

  service smsd restart