File content as of revision 3:56c6df84e619:

#include "mbed.h"
#include "EthernetInterface.h"
#include "dispBoB.h"
#include <string>
#include <vector>
#include <sstream>
#include <utility>

namespace {
    const char* MUNIN_SERVER_ADDRESS = "172.28.22.45";
    const int MUNIN_SERVER_PORT = 4949;
    char CMD_FETCH_USERS[] = "fetch users\n";
}


class MuninDisplay {
public:
    MuninDisplay::MuninDisplay() : db(p28, p27, p26) {
        db.cls();   
    }

    void lcd_print_str(const char *str) {
        db.cls();
        db.printf("%s\n", str);        
    }

    void dhcp_connection() {
        printf("DHCP: Connecting ... ");
        eth.init(); //Use DHCP
        eth.connect();
        printf("%s\r\n", eth.getIPAddress());
    }
    
    int socket_connection() {
        printf("TCP: Connecting ... ");
        int ret = socket.connect(MUNIN_SERVER_ADDRESS, MUNIN_SERVER_PORT) < 0;
        printf("[OK]\r\n");
        return ret;
    }

    int socket_close() {
        socket.close();
    }

    int socket_recv() {
        const int n = socket.receive(buf, sizeof(buf) - 1);
        if (n > 0) {
            buf[n] = '\0';
            printf("RECV: %s\r\n", buf);
        }
        return n;   
    }

    int socket_recv_all() {
        const int n = socket.receive_all(buf, sizeof(buf) - 1);
        if (n > 0) {
            buf[n] = '\0';
            printf("RECV: %s\r\n", buf);
        }
        return n;   
    }

    int socket_send(char *cmd, const int cmd_size) {
        const int n = socket.send(cmd, cmd_size - 1);
        return n;
    }

    int get_param_value(std::string param_name) {
        std::vector<std::string> s = explode(std::string(buf), '\n');
        
        for (std::vector<std::string>::iterator it = s.begin(); it != s.end(); ++it) {
            std::string &param = *it;
            printf("PARAM_RECV: %s\r\n", param.c_str());
            if (!param.compare(0, param_name.size(), param_name)) {
                printf("PARAM_FOUND: %s is '%s' \r\n", param.c_str(), param_name.c_str());
                std::vector<std::string> name_value = explode(param, ' ');
                if (name_value.size() == 2) {
                    const int val = atoi(name_value[1].c_str());
                    db.cls();
                    db.printf(" %s\n", name_value[1].c_str());
                    printf("DISPLAYING: %s\r\n", name_value[1].c_str());                    
                    return val;
                }
            }
        }
        return 0;
    }

protected:
    EthernetInterface eth;
    TCPSocketConnection socket;
    dispBoB db;
    char buf[256];

    std::vector<std::string> explode(std::string const &s, char delim)
    {
        std::vector<std::string> result;
        std::istringstream iss(s);
        for (std::string token; std::getline(iss, token, delim); ) {
            result.push_back(token);
        }
        return result;
    }
};

int main() {
    MuninDisplay munin_lcd;
    munin_lcd.dhcp_connection();    // DHCP connection
                
    while(true) {
        while (munin_lcd.socket_connection() < 0) {
            wait(1);
        }

        munin_lcd.socket_recv();
        munin_lcd.socket_send(CMD_FETCH_USERS, sizeof(CMD_FETCH_USERS));
        munin_lcd.socket_recv_all();
        munin_lcd.get_param_value("usercount.value");
          
        munin_lcd.socket_close();
        wait(3);
    }
}