Software-Installation
mosquitto_sub –d –t armtronix_mqtt 錯誤：未知選項“–d”
可以收集哪些資訊以採取糾正措施以啟用對範例 MQTT 主題的訂閱？
目標是按照 說明的第 3 步重現測試（訂閱和發布） ：安裝了 MQTT 伺服器，但嘗試使用 MQTT 客戶端訂閱失敗：
pi@raspberrypi:~ $ mosquitto_sub –d –t armtronix_mqtt **Error: Unknown option '–d'.** Use 'mosquitto_sub --help' to see usage.幫助頁面：
pi@raspberrypi:~ $ mosquitto_sub --help mosquitto_sub is a simple mqtt client that will subscribe to a single topic and print all messages it receives. mosquitto_sub version 1.4.10 running on libmosquitto 1.4.10. Usage: mosquitto_sub [-c] [-h host] [-k keepalive] [-p port] [-q qos] [-R] -t topic ... [-C msg_count] [-T filter_out] [-A bind_address] [-S] [-i id] [-I id_prefix] [-d] [-N] [--quiet] [-v] [-u username [-P password]] [--will-topic [--will-payload payload] [--will-qos qos] [--will-retain]] [{--cafile file | --capath dir} [--cert file] [--key file] [--ciphers ciphers] [--insecure]] [--psk hex-key --psk-identity identity [--ciphers ciphers]] [--proxy socks-url] mosquitto_sub --help -A : bind the outgoing socket to this host/ip address. Use to control which interface the client communicates over. -c : disable 'clean session' (store subscription and pending messages when client disconnects). -C : disconnect and exit after receiving the 'msg_count' messages. -d : enable debug messages. -h : mqtt host to connect to. Defaults to localhost. -i : id to use for this client. Defaults to mosquitto_sub_ appended with the process id. -I : define the client id as id_prefix appended with the process id. Useful for when the broker is using the clientid_prefixes option. -k : keep alive in seconds for this client. Defaults to 60. -N : do not add an end of line character when printing the payload. -p : network port to connect to. Defaults to 1883. -P : provide a password (requires MQTT 3.1 broker) -q : quality of service level to use for the subscription. Defaults to 0. -R : do not print stale messages (those with retain set). -S : use SRV lookups to determine which host to connect to. -t : mqtt topic to subscribe to. May be repeated multiple times. -T : topic string to filter out of results. May be repeated. -u : provide a username (requires MQTT 3.1 broker) -v : print published messages verbosely. -V : specify the version of the MQTT protocol to use when connecting. Can be mqttv31 or mqttv311. Defaults to mqttv31. --help : display this message. --quiet : don't print error messages. --will-payload : payload for the client Will, which is sent by the broker in case of unexpected disconnection. If not given and will-topic is set, a zero length message will be sent. --will-qos : QoS level for the client Will. --will-retain : if given, make the client Will retained. --will-topic : the topic on which to publish the client Will. --cafile : path to a file containing trusted CA certificates to enable encrypted certificate based communication. --capath : path to a directory containing trusted CA certificates to enable encrypted communication. --cert : client certificate for authentication, if required by server. --key : client private key for authentication, if required by server. --ciphers : openssl compatible list of TLS ciphers to support. --tls-version : TLS protocol version, can be one of tlsv1.2 tlsv1.1 or tlsv1. Defaults to tlsv1.2 if available. --insecure : do not check that the server certificate hostname matches the remote hostname. Using this option means that you cannot be sure that the remote host is the server you wish to connect to and so is insecure. Do not use this option in a production environment. --psk : pre-shared-key in hexadecimal (no leading 0x) to enable TLS-PSK mode. --psk-identity : client identity string for TLS-PSK mode. --proxy : SOCKS5 proxy URL of the form: socks5h://[username[:password]@]hostname[:port] Only "none" and "username" authentication is supported.MQTT 客戶端安裝日誌：
pi@raspberrypi:~ $ sudo apt-get install mosquitto-clients Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: coinor-libipopt1v5 libmumps-seq-4.10.0 libraw15 Use 'sudo apt autoremove' to remove them. The following additional packages will be installed: libmosquitto1 The following NEW packages will be installed: libmosquitto1 mosquitto-clients 0 upgraded, 2 newly installed, 0 to remove and 1 not upgraded. Need to get 99.5 kB of archives. After this operation, 222 kB of additional disk space will be used. Do you want to continue? [Y/n] y Get:1 http://raspbian.raspberrypi.org/raspbian stretch/main armhf libmosquitto1 armhf 1.4.10-3+deb9u4 [47.2 kB] Get:2 http://raspbian.raspberrypi.org/raspbian stretch/main armhf mosquitto-clients armhf 1.4.10-3+deb9u4 [52.3 kB] Fetched 99.5 kB in 1s (86.7 kB/s) Selecting previously unselected package libmosquitto1:armhf. (Reading database ... 141867 files and directories currently installed.) Preparing to unpack .../libmosquitto1_1.4.10-3+deb9u4_armhf.deb ... Unpacking libmosquitto1:armhf (1.4.10-3+deb9u4) ... Selecting previously unselected package mosquitto-clients. Preparing to unpack .../mosquitto-clients_1.4.10-3+deb9u4_armhf.deb ... Unpacking mosquitto-clients (1.4.10-3+deb9u4) ... Processing triggers for libc-bin (2.24-11+deb9u4) ... Processing triggers for man-db (2.7.6.1-2) ... Setting up libmosquitto1:armhf (1.4.10-3+deb9u4) ... Setting up mosquitto-clients (1.4.10-3+deb9u4) ... Processing triggers for libc-bin (2.24-11+deb9u4) ...
.listRaspbian buster 的文件安裝：pi@raspberrypi:~ $ cd /etc/apt/sources.list.d/ pi@raspberrypi:/etc/apt/sources.list.d $ sudo wget http://repo.mosquitto.org/debian/mosquitto-buster.list --2019-08-01 00:01:16-- http://repo.mosquitto.org/debian/mosquitto-buster.list Resolving repo.mosquitto.org (repo.mosquitto.org)... 85.119.83.194, 2001:ba8:1f1:f271::2 Connecting to repo.mosquitto.org (repo.mosquitto.org)|85.119.83.194|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 50 [application/octet-stream] Saving to: ‘mosquitto-buster.list’ mosquitto-buster.list 100%[===================================================================>] 50 --.-KB/s in 0s 2019-08-01 00:01:17 (1.14 MB/s) - ‘mosquitto-buster.list’ saved [50/50] pi@raspberrypi:/etc/apt/sources.list.d $ mosquitto_sub –t armtronix_mqtt Error: Unknown option '–t'. Use 'mosquitto_sub --help' to see usage. pi@raspberrypi:/etc/apt/sources.list.d $ sudo apt-get install mosquitto-clients Reading package lists... Done Building dependency tree Reading state information... Done mosquitto-clients is already the newest version (1.4.10-3+deb9u4). The following packages were automatically installed and are no longer required: coinor-libipopt1v5 libmumps-seq-4.10.0 libraw15 Use 'sudo apt autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. pi@raspberrypi:/etc/apt/sources.list.d $ mosquitto_sub –t armtronix_mqtt Error: Unknown option '–t'. Use 'mosquitto_sub --help' to see usage. pi@raspberrypi:/etc/apt/sources.list.d $ mosquitto_sub -d –t armtronix_mqtt Error: Unknown option '–t'. Use 'mosquitto_sub --help' to see usage.
我不知道你輸入的是什麼字元，
-但它是錯誤的。您應該使用簡單的減號/連字元/破折號，但您似乎使用的是某種較長的破折號：–t incorrect -t correct在我的英國鍵盤上，它是 和 之間的鍵
0，=無需移位即可使用。