SIM800C

Sim800c is a Ruby gem that provides a clean interface to the SIM800C GSM/GPRS module using AT commands over a serial connection. Easily send SMS, manage inbox/outbox, query signal strength, check battery info, and more.

---

Features

• 📤 Send SMS (immediate or stored)
• 📩 Read, list, and delete messages
• 📶 Monitor signal quality (RSSI)
• 🔋 Check battery status and voltage
• 💾 Get SIM storage usage info

---

Installation

gem 'sim800c'

then run:

bundle install

Or install it directly:

gem install sim800c

Overview

require 'sim800c'

port_path = Sim800c::PortScanner.find_port # /dev/ttyUSB0
client = Sim800c::Client.new(port_path, baud: 9600)

# Send SMS
client.send_message("+639123456789", "Hello from SIM800C!")

# Store and then send SMS
client.save_and_send_message("+639123456789", "Stored first, sent later")

# List of all messages
puts client.list_messages.all

# Check signal quality
puts client.signal_quality.info

# Get battery info
puts client.device.battery_info

# Delete message by index
client.delete_message.by_index(1)

# ...and more

Usage

Message Listing

messages = client.list_messages

messages.all    # => All messages
messages.unread # => Only unread messages
messages.read   # => Read messages
messages.unsent # => Unsent messages
messages.sent   # => Sent messages

Message Deletion

deleter = client.delete_message

deleter.by_index(1)              # => delete specific message by index
deleter.all                      # => delete all messages
deleter.all_read                 # => delete all read messages
deleter.all_read_and_sent        # => delete all read and sent messages
deleter.all_read_sent_and_unsent # => same with .all

Signal Quality

signal = client.signal_quality

signal.info   # => { rssi: 25, bars: 5, strength: 'Excellent' }
signal.rssi   # => 25

Device / Battery Info

device = client.device

device.battery_info
# => {
#      charge_status: 0,
#      battery_level: 100,
#      voltage_mv: 4367,
#      charge_status_label: "Not charging"
#    }

Storage Info

client.storage_info
# => [{
#       storage_type: "read_write",
#       memory: "SM",
#       used: 2,
#       total: 30
#    }]

TODOs:

• Add HTTP/TCP support
• Enable incoming SMS handling (AT+CNMI)
• Command retries with timeout/backoff

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/denmarkmeralpis/sim800c. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Sim800c project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.