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谭艳华 / 4G 模块实现拨号上网

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BSD-3-Clause

4G 模块实现拨号上网

一、介绍

此项目基于树莓派4B搭载EC20 4G模块,模拟出USB网卡,使用USB上网并通过串口通信编程实现AT指令的定时收发,包括AT指令检测网卡情况、检测SIM卡情况、检测信号强度等; 通过AT指令获取运营商的MCC与MNC参数,利用获取的参数从保存APN的xml文件中解析出所需APN,并设置运营商; 定时检测当前网络状态,在有线网络、无线网络都异常的情况下,使用PPP协议实现拨号上网,开启4G网络,通过测试网络状态可以在三种网络状态中切换。

二、项目流程

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三、测试

1. 检测网络状况良好,打开串口

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2. AT指令的收发

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3. 拨打电话

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3. 定时ping测试网络状况

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4. PPP拨号脚本

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5. PPP拨号上网

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6. 虚拟网卡ppp0

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BSD 3-Clause License Copyright (c) 2022, 谭艳华 All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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