## 6 Prototype Implementation and Evaluation
### Hardware Specifications  
The Kerlink Wirma Road (Figure 8) is an energy-efficient ARM926 EJ-S platform provided with a 2.6.27 Linux kernel. The ARM926 EJ-S processor is one of the most popular ARM processors. The MR includes some M2M services and provides several communication capabilities. An integrated  
Figure 7: DHCPv6 default router list option fields. This option is used by the server to answer option request option (ORO) option sent by the client.  
chipset provides GSM/GPRS cellular network service. An integrated WiFi module provides IEEE 802.11b/g connection. An integrated GPS module provides accurate geographic coordinates. GPRS, WiFi and GPS antennas are unified in one vehicle roof antenna. Unfortunately, no 3G support was natively implemented, so an additional USB-modem has to be plugged in for this end. According to the manufacturer, 10% of the regional bus companies in Paris (France) are equipped with this gateway.  
For testbed purposes, an additional NETGEAR access point (AP) is plugged into the MR with a USB-Ethernet converter. Its purpose is to ease mobile phone attachment to the network advertised by the AP (Extended Service Set Identification (ESSID) \"EXALTED\", WEP Key).  
The eHealth devices (Figure 9) used for the testbed are manufactured by CardGuard [33]. The oxygen saturation level is measured by OxyPro, a wireless pulse oximeter. It provides for real time measurements and can be operated in continuous mode. It also provides pulse monitoring. It displays oxygen saturation and pulse rate averages with the absolute maximum and minimum measurements.  
The blood glucose and pressure measurement is performed by an Easy2 Check device. Blood glucose is measured with the use of an amperometric biosensor, where fresh capillary blood is deposited. Its accuracy ranges from \(\pm\)15 mg/dL, when glucose \(<\)75 mg/dL, to \(\pm\)20%, when glucose \(>\)75 mg/dL. Accordingly, for the pressure measurements, the accuracy is \(\pm\)3 mmHg or \(\pm\)2% of reading.  
Self-check ECG offers one to 12 leads ECG event monitoring. It is intended for monitoring symptoms that may suggest abnormal heart function: skipped beats, palpitations, racing heart, irregular pulse, faintness, lightheadedness or a history of arrhythmia. The recording period is set at 32 s, while the bandwidth is 0.05-35 Hz for the 12 leads and 0.4-35 Hz for the one lead.  
Spiro Pro is a spirometer that records volume (time and volume) flow curves according to international performance standards. It measures lung ventilatory functions during forced vital capacity (FVC) tests. The recording lasts for 17 s, and its accuracy for the FVC and FEV 1 is \(+\)5% or \(+\)0.1 L. It is mostly used for asthma or COPD monitoring.  
Figure 8: Kerlink Wirma Road gateway.  
A medical application is installed on an Android smartphone (IPv6-capable), which receives the vital signs from the portable monitoring devices via Bluetooth. The recorded data from the devices have to be transferred to a designated web center. The application provides a simple electronic health record (EHR) for disease management and treatment and initiates patients' active involvement in healthcare. Analytically, it features browsing on the exam history, viewing of the recorded data, downloading of a diagnosis or advice from a doctor, comments addition and more. The final destination of these data is the EHR of the patient. This data is hosted in a dedicated server from where it is accessible for reviewing under secure credentials by the treating physicians.