waspmote-gsm-gprs-pr.. - Libelium

General Considerations1. General Considerations1.1. Differences between“GPRS” and“GPRS PRO” libraries forWaspmoteGPRS libraries were developed to control the Hilo module (from Sagem). The GPRS_Pro libraries had been developed to controlthe new GPRS board which integrates the SIM900 module (from SIMCom). GPRS_Pro performs the same actions that GPRSmodule (some functions had been enhanced) and new functions has been added such as multiconnection for TCP/IP and UDP/IP clients, audio control or operator selection.Regarding power consumption it has been reduced from 56μA to 30μA in power down mode (GPRS_OFF power mode).The SIM900 module improves TCP/IP and UDP/IP connections adding new features such as TCP/IP server and multiconnectionmode that allows up to 8 TCP/UDP clients or up to 7 TCP/UDP clients and 1 TCP/IP server. Extra functions such as autosendingtimer, add IP headers, setting DNS servers,... have been added.Also uploading and downloading functions have been upgraded to allow to select the origin and destiny folder into the SD cardand FTP server.New functions allow to manage speaker level, Calling Line Identification (CLI) , mute, call alert. Also GSM/GPRS operatorconnection can be managed with functions such as get current operator, set preferred operator list, get cell information.1.2. HardwareFigure 1: GSM/GPRS moduleModel: SIM900 (SIMCom)Quadband: 850MHz/900MHz/1800MHz/1900MHzTX Power: 2W (Class 4) 850MHz/900MHz, 1W (Class 1) 1800MHz/1900MHzSensitivity: -109dBmAntenna connector: UFLExternal Antenna: 0dBiConsumption in power down mode: 30µA-6- v0.5