如何编写AT + CUSD usdd命令以支持最大听筒数量

Since you are checking the final result codes for any AT command you issue in any case (you are, right?), it is not that much extra work to implement a fallback algorithm: 首先尝试使用dcs = 15调用如果失败，则使用dcs = 32调用最后，如果以上所有方法均失败，请尝试不使用dcs.这应该是在大量手机上调用AT+CUSD的最便捷的方式.This should be the most portable way to invoke AT+CUSD on a large set of handsets.顺便说一下，请注意27.007规范中的<n>的0值带有下划线.它有点微妙，但这意味着它是默认值，而没有明确说明(例如，对<dsc>所做的操作).因此AT+CUSD=与AT+CUSD=0相同(实际上，您甚至可以像调用AT+CUSD=0,"*123#"一样调用AT+CUSD=,"*123#"，尽管您可能会遇到无法正确解析此问题的电话.Sony Ericson早期生产的所有电话/调制解调器，几乎所有产品都会在以后生产，并且所有基于 ST-Ericsson 平台的手机正确解析).By the way, notice that the 0 value for <n> is underlined in the 27.007 specification. It is a bit subtle but it means that it is a default value, without saying so explicitly (like done for <dsc> for instance). So AT+CUSD= is the same as AT+CUSD=0 (and actually you could even invoke AT+CUSD=,"*123#" as the same as AT+CUSD=0,"*123#", although you might encounter phones that fail to parse this correctly. All phones/modems produced early by Sony Ericson, and almost all produced later, and all phones based on platforms from ST-Ericsson will parse this correctly).如果您想自动化测试，可以使用我的 atinout 程序，例如:If you want to automate testing you can do so using my atinout program, e.g.:echo ATE1 | atinout - /dev/ttyACM0 -for i in $(seq 0 15) 32; \do \ echo AT+CUSD=1,"xxxx",$i; \done | atinout - /dev/ttyACM0 -如果您的调制解调器设备是/dev/ttyASM0.if your modem device is /dev/ttyASM0. 更新:您为字符串选择的字符集很可能是问题所在，如此答案中所述.尝试运行AT+CSCS="GSM"并查看是否有帮助.Update: Your selected character set for strings might quite possibly be the problem here like described in this answer. Try to run AT+CSCS="GSM" and see if that helps. 这篇关于如何编写AT + CUSD usdd命令以支持最大听筒数量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！