Interface with GSM modem for sending AT, USSD and SMS commands

Avg Bid (USD)
Project Budget (USD)
$1500 - $3000

Project Description:
What I need to build:

I need a server capable of sending commands to 3 GSM modems (3 Separate Thai Networks). These commands will send top up credit to a customer's mobile phone.

You should be a programmer familiar with AT commands, GSM modems, USSD codes. I know this software exists as I currently use it with another provider.

I need also need a management interface where I can:
- Send Credit
- View Confirmations
- View Errors
- Track balance
- Send Recall commands
- History of all records
- API access / website communication

GSM modem reference guide:

Skills required:
Mobile Phone
About the employer:
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