Software Development Expertise

Hillstone Software offers software development and consultancy services to technology, telecommunications and electronics companies in around the world

Development Languages

We specialize in C and C++ software development

Target platforms

  • Unix / Linux, 32 and 64 bit
  • Windows desktop OSes: XP, Vista, 7, 32 and 64 bit
  • Windows Mobile and Windows CE
  • MAC OS X
  • iPhone / iPAD iOS
  • Embedded systems

Development tools

  • Microsoft Visual Studio 2003 and 2010
  • Linux GCC
  • XCode

Communication protocols and Technologies:

We have direct experience in either full implementation or in using the following protocols: RS232C, I2C, IP, TCP, UDP, PPP and multilink PPP, ICMP, TFTP, FTP, SMTP, POP3, NTP, HTTP, P1024C, ISO 1745 (IBRO-30 EFT POS), TPAD, HDLC / LAPD /LAPB, X.25, X.31, ISDN layer 3 (Q.931), XMODEM, V.23/Bel FSK / Caller ID, GSM/GPRS, Bluetooth, H.323, RTP, GSM 07.05, GSM 03.40 (SMS).,GPS NMEA 183, XOT (RFC1613), ISO TP over TCP (RFC1006), ICE (Interactive Connectivity Establishment), NAT Traversal / Hole punching / Peer to Peer applications, NAT-PMP, UPNP, Libjingle (XMPP), TCP over UDP, RTP audio streaming, VNC, Audio processing and VoIP (voice over IP), High performace high capacity network server programming on Linux and Windows.

Encryption and Authentication:

AES, DES, Triple DES, ARC4 (Alleged RC4), CAST-128 (a.k.a CAST5), Blowfish, Twofish, RSA, MD5 (message digest algorithm), SHA-1 (Secure Hash Algorithm)

Device Drivers Software Development:

Motorola SCI and SPI systems, 80C51 serial drivers, A/Ds, LCDs and 7-seg LEDs, I2C EEPROMs, chip monitors, UARTs & DMA, RF transceivers and telephony hardware: voice codecs (Siemens, VoicePump / DSP Group, Lucent), SLICs (AMD, Lucent), Realtek ethernet switch, Conexant V.92 modem chipset., Nokia, Falcom and Siemens GSM / GPRS modules

Past Projects:

  • Development Audio Streaming library (PCM Audio to RTP) for Windows, MAC OS X and iOS
  • Development of Loopback audio driver for MAC OS X for streaming system audio over RTP
  • Development of Reliable UDP protocol (based on RUDP) and implementation of TCP over UDP
  • Development of XMPP like peer to peer connectivity solution
  • Development of ICE protocol (interactive connectivity establishment) for NAT traversal
  • Development of TURN UDP relay server for Linux
  • Development of high capacity high performance socket server / peer to peer routing server / for Linux
  • Development of NTP Synchronization DLL for use with Stock trading terminal software
  • Development of custom Print server and Search server solution for Windows.
  • Custom integration of VNC server into user applicatoin on Windows
  • Development of GPS module drivers for embedded platform
  • Development of RFID smart card and GPS integration utility for Windows XP
  • Development of TFTP DLL for use from Visual Basic on Windows OS
  • Development of XMODEM upload utility for Windows OS and embedded system
  • Development of DLL library and Front End GUI for interfacing Visual Basic Stock Exchange trading terminal application to Eicon X.25 card
  • GSM / GPRS card driver (embedded system)
  • Low level V.92 modem driver (embedded system)
  • Device drivers for Security Badge Reader Controller and 6 Port RS485 Security Network Hub (embedded system)
  • Design and implementation of airline network terminal, supporting 12 RS232C ports, Ethernet, X25, Netbios and P1024 (terminal protocol for Airline reservation network)