一种LoRaWAN网关虚拟终端

源码来自ARM mbed，第三方开发，所以不是标准实现。HCI基于UART，采用VT100终端协议。拿来对比，以避免遗漏HCI需求。

const menu_item_t menu_items[] = 
{   /* after first character, command names must be [A-Za-z] */
    { "?", cmd_help, "","show available commands"}, 
    { ".", cmd_status, "","read status"}, 
    { "f", cmd_filter, "%x","set dev_addr print filter"}, 
    { "b", cmd_beacon_payload, "<%x>","set beacon payload"}, 
    { "sb", cmd_skip_beacon, "<%d>","skip beacons"}, 
    { "list", cmd_list_motes, "","list active motes"}, 
    { "dl", cmd_send_downlink, "[%x %s]","send downlink <mote-hex-dev-addr> <hex-payload>"}, 
    { "rxr", cmd_rx_restart, "", "restart RX"},
    { "brgb", cmd_beacon_rgb, "%u %u %u", "load RGB command into next beacon" },
    { "rgb", cmd_downlink_rgb, "%x %u %u %u", "load RGB command to mote"},
    { "bgpo", cmd_beacon_gpo, "%d", "load output pin command into next beacon"},
    { "gpo", cmd_downlink_gpo, "%x %d", "load output pin command to mote"},
    { "op", cmd_op, "<dBm>","(TX) get/set TX power"},  
#ifdef TYPE_ABZ
    { "pas", cmd_pa_select, "","(TX) toggle PaSelect"},  
#endif
    { "tz", cmd_set_time, "", "set seconds to zero"},   
    { "p", cmd_pwm, "%x %u %u", "send pwm period, duty to dev_addr"},
    { "bp", cmd_beacon_pwm, "%u %u", "send pwm period, duty on beacon"},
    { "ntxp", cmd_endnode_txp, "%x %u", "send txpower index to dev_addr"},
    { "bntxp", cmd_beacon_endnode_txp, "%u", "send txpower index on beacon"},
    { "hm", cmd_hide_mac, "", "hide mac layer printing "},
    { "hp", cmd_hide_payload, "", "hide payload printing"},
    { "sa", cmd_show_all, "", "show both mac and app layers"},
    { NULL, NULL, NULL, NULL }
};

解释

从HCI指令注释和代码，可以看出有beacon与mote两种设备。分别可以远程设置PWM/GPIO/TXP等参数。此外都是调试和其他辅助功能。大多数与应用相关的指令可以中性化，简化通用为配置、下发、上传等。

• 帮助，可以忽略
• 状态，返回PA/OpMode/IRQ/Dio/Fifo等寄存器
• 地址过滤，开关设备地址过滤器
• 信标负荷，将符合数据发送给Beacon设备
• 跳过信标，Beacon数据包是可以忽略的
• 设备列表，罗列当前活跃的设备和地址信息
• 下发信息，向特定地址设备下发数据
• 接收重启，把收发器重置为接受状态
• 信标RGB，把RGB信息下发到Beacon设备
• MoteRGB，把RGB信息下发到Mote设备
• 信标引脚，把GPO信息下发到Beacon设备
• Mote引脚，把GPO信息下发到Mote设备
• 设置功率，读写TX功率
• 切换功放，切换PaSelect选择合适的功放电路
• 重置定时器，把MCU内置tick复位
• 信标PWM，设置Beacon PWM输出
• MotePWM，设置Mote PWM输出
• 下发TXP，设置远程设备的TXP输出
• 信标TXP，设置Beacon的TXP输出
• 隐藏MAC层打印，辅助
• 隐藏负荷打印，辅助
• 隐藏MAC/APP层打印，辅助

这个网关代码已经实现了LoRaWAN MAC层和应用层，还包括了大量加解密算法。编译后的代码为74KB。如果将这些指令、MAC/APP简化，很大概率可以压缩在64KB里。